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  • sin
    sin
    noun
    transgression of divine law.
  • sīn
    sīn
    noun
    the 12th letter of the Arabic alphabet.
  • Sin
    Sin
    noun
    the Akkadian god of the moon: the counterpart of the Sumerian Nanna.
  • SIN
    SIN
    abbreviation
    social insurance number
Synonyms

sin

1 American  
[sin] / sɪn /

noun

  1. transgression of divine law.

    the sin of Adam.

    Synonyms:
    violation, trespass, misdeed
  2. any act regarded as such a transgression, especially a willful or deliberate violation of some religious or moral principle.

    Synonyms:
    wickedness, wrong
  3. any reprehensible or regrettable action, behavior, lapse, etc.; great fault or offense.

    It's a sin to waste time.


verb (used without object)

  • sins,
    present (3rd person singular)
  • sinned,
    past participle,  past
  • sinning
    present participle
  1. to commit a sinful act.

    Synonyms:
    trespass, transgress
  2. to offend against a principle, standard, etc.

verb (used with object)

  • sins,
    present (3rd person singular)
  • sinned,
    past participle,  past
  • sinning
    present participle
  1. to commit or perform sinfully.

    He sinned his crimes without compunction.

  2. to bring, drive, etc., by sinning.

    He sinned his soul to perdition.

sin 2 American  
[seen] / sin /

noun

  1. the 22nd letter of the Hebrew alphabet.

  2. the consonant sound represented by this letter.


sin 3 American  

abbreviation

Trigonometry.
  1. sine.


sīn 4 American  
[seen] / sin /

noun

  1. the 12th letter of the Arabic alphabet.


Sin 5 American  
[seen] / sin /

noun

  1. the Akkadian god of the moon: the counterpart of the Sumerian Nanna.


sin 1 British  
/ saɪn /

abbreviation

  1. sine

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

sin 2 British  
/ siːn /

noun

  1. a variant of shin, the 21st letter in the Hebrew alphabet (שׂ), transliterated as S See shin 2

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

sin 3 British  
/ sɪn /

noun

  1. theol

    1. transgression of God's known will or any principle or law regarded as embodying this

    2. the condition of estrangement from God arising from such transgression See also actual sin mortal sin original sin venial sin

  2. any serious offence, as against a religious or moral principle

  3. any offence against a principle or standard

  4. informal (of an unmarried couple) to live together

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

  1. theol to commit a sin

  2. (usually foll by against) to commit an offence (against a person, principle, etc)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
SIN 4 British  

abbreviation

  1. social insurance number

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

sin 5 British  
/ sɪn /

preposition

  1. a Scot dialect word for since

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

sin Scientific  
  1. Abbreviation of sine


sin Idioms  
  1. see live in sin; more sinned against than sinning; multitude of sins; ugly as sin; wages of sin.


Synonym Usage

See crime.

Other Word Forms

Derived Forms

Inflected Forms

Participles

Conjugated Forms

Present

Past

Future

Etymology

Origin of sin1

First recorded before 900; Middle English noun sinne, sin(e), sen(ne), Old English syn(n) “moral or religious offense, misdeed”; akin to German Sünde, Old Norse synd, Latin sōns (inflectional stem sont- ) “guilty,” literally “that man being the one”; the verb is derivative of the noun; the Germanic and Latin forms all being present participle forms of the root es- “to be”; see origin at am ( def. )

Origin of sin2

First recorded in 1895–1900; from Hebrew śīn

Origin of sīn4

From Arabic

Explanation

You might not want to be the one at the party who takes the last piece of cake, but then again, it would be a sin to let it sit there, uneaten. A sin is a deeply regrettable action. The most common definition of sin is religious: it's an immoral act against God or divine law. Any serious offense, even if it's not religious, can be called a sin, and so can something less serious if you're talking about it in a joking way, as in, "You've got to buy those shoes — it would be an absolute sin not to." In math, sin is the abbreviation of sine, the trigonometric function.

Keep Reading on Vocabulary.com

Vocabulary lists containing sin

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

One of Odysseus’ defining triumphs becomes, in Nolan’s telling, something closer to an original sin.

From Los Angeles Times Jul. 21, 2026

She had converted to Catholicism in the 1990s, telling The Times: "To have a church which calls a sin a sin and has done with it is a blessed relief."

From BBC Jul. 10, 2026

On a recent episode of What Next, Lizzie O’Leary spoke to Nagle about how America’s original sin is written into who we are today.

From Slate Jul. 3, 2026

The evocations of inherited sin, historical guilt and supernatural horror established a model for a haunted literary tradition.

From The Wall Street Journal Jun. 19, 2026

To our left were the other bridges of Manhattan, arrayed against each other like alternating sin and cos waves, carrying a smattering of late-night trucks whose tops trailed mist.

From "It’s Kind of a Funny Story" by Ned Vizzini

Sine, sīn, n. a straight line drawn from one extremity of an arc perpendicular to the diameter that passes through the other extremity.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

Dō brāhte man die vrouwen     dā si in ligen vant. si huop sīn schœne houbet     mit ir vil wīȥen hant; dō kuste s’ alsō tōten     den edelen ritter guot.

From A Middle High German Primer Third Edition by Joseph Wright

Sī koment underwīlen her die baȥ dā heime möhten sīn.

From A Middle High German Primer Third Edition by Joseph Wright

The present participle with sīn is sometimes used as in English, see ‘Arme Heinrich,’ l. 24.

From A Middle High German Primer Third Edition by Joseph Wright

I, sink, 76. sigenunft, sf. victory. sīhte, aj. shallow. silber, sn. silver. sim = si im. sin, sm. sense, mind, feeling; courage. sīn, pr. his; sīn sëlbes, of himself, 5, 11, 67.

From A Middle High German Primer Third Edition by Joseph Wright

Tip Toe followed Davies' award-winning series It's a Sin, about friends living in London during the HIV/Aids crisis in the 1980s.

From BBC Jul. 6, 2026

Thousands who flew into Sin City on the insurer’s dime were treated to a Pink concert, a Jimmy Fallon-led singalong and selfies with the “Jake from State Farm” actor.

From The Wall Street Journal Jun. 17, 2026

But analysts are growing more confident in a Las Vegas comeback, and MGM also isn’t as dependent on Sin City as some competitors.

From Barron's Jun. 1, 2026

As he drove to Sin City for bowling tournaments, Honell would stop and “drop a few coins” into the slot machines.

From Los Angeles Times May 8, 2026

I was uninjured, and since pride is a Deadly Sin which I feel I generally eschew, absolutely nothing was hurt.

From "A Confederacy of Dunces" by John Kennedy Toole

Pura Casilla, the governor of San Cristobal province, told Noticias SIN that the explosion occurred in a commercial area and greatly affected businesses near the town center.

From Seattle Times Aug. 15, 2023

The description for the folder Correspondence SIN reads:

From The Guardian Mar. 23, 2017

These may be labeled, for example, SIN , ARCSIN, or ASIN.

From Textbooks Feb. 13, 2015

Ms. Martin’s two-year-old fitness-concierge business, SIN Workouts, recommends and books group fitness classes such as SoulCycle for clients.

From New York Times Dec. 17, 2014

"Black Hand over Europe" by Henri Pozzi, 1935 THE SIN Yugoslavia was born in sin and in sin it perished.

From Terrorists and Freedom Fighters by Samuel Vaknin

Still, the tour doesn’t shy away from the mission’s sins over its 250 years, demystifying how supposedly carefree life was during the height of its operations before the United States conquered Mexico.

From Los Angeles Times Jul. 4, 2026

“The beauty of this narrative was that it not only absolved Jefferson and his fellow slaveholders of their sins; it absolved America as a whole,” Mr. Rasenberger writes.

From The Wall Street Journal Jul. 2, 2026

But as sins go, this one was tough for two diehard British mystery fans to resist.

From Salon Jun. 16, 2026

"If you list my sins, I sound like the worst person on Earth," he said in a TED interview in 2022.

From BBC Jun. 4, 2026

But as we shall see in chapter 6, using a comma to separate a subject from its predicate or a verb from one of its complements is among the most grievous sins of mispunctuation.

From "The Sense of Style" by Steven Pinker

She danced and sinned and regretted and atoned, and then contradicted herself by doing it all over again.

From Salon Jul. 8, 2026

His lawyers argued that while he had engaged in bad behavior and sinned against his wife, he had not broken the law.

From Washington Post Apr. 2, 2023

After listing all those for whom she writes — “for the sinned against and the sanctifying” — Perry called for unity in difficult times:

From Los Angeles Times Nov. 17, 2022

Even if your daughters are, in some sense, more sinned against than sinning, you could reasonably worry that putting resources in their hands will allow them to support destructive causes.

From New York Times Mar. 1, 2022

Yes, he had sinned, and his father was looking for him.

From "Go Tell It on the Mountain" by James Baldwin

Crusaders came to expect standard privileges like the indulgence, a means to reduce the penance owed for sinning by giving money directly to the church or paying for masses or other clerical services.

From Textbooks Apr. 19, 2023

He never punishes his female leads for sinning; instead he celebrates their resilience.

From New York Times Dec. 13, 2021

He insists he is a man more sinned against than sinning and is working with lawyers to clear his name.

From BBC Jul. 13, 2021

I’ve been oppressed by all these facts and evidence that dinned against My simple claim that I am not more sinning than I’m sinned against.

From Washington Post Jul. 7, 2021

I never sinning I always winning Now I got Jesus.

From "A Confederacy of Dunces" by John Kennedy Toole

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