having an acid taste, resembling that of vinegar, lemon juice, etc.; tart.
rendered acid or affected by fermentation; fermented.
producing the one of the four basic taste sensations that is not bitter, salt, or sweet.
characteristic of something fermented.
a sour smell.
distasteful or disagreeable; unpleasant.
below standard; poor.
It was a sour effort all around, the kind of effort that doesn't exactly inspire confidence.
harsh in spirit or temper; acrimonious; disagreeable; peevish.
Agriculture. (of soil) having excessive acidity.
(of gasoline or the like) contaminated by sulfur compounds.
Music. off-pitch; badly produced.
a sour note.
something that is sour.
any of various cocktails consisting typically of whiskey or gin with lemon or lime juice and sugar and sometimes soda water, often garnished with a slice of orange, a maraschino cherry, or both.
any of various beers with a particularly acidic or tart taste, made so by acid-producing bacteria and yeast in the brew.
Sours are a good choice to go with deep-fried bar food.
an acid or an acidic substance used in laundering and bleaching to neutralize alkalis and to decompose residual soap or bleach.
to become sour, rancid, mildewed, etc.; spoil.
Milk sours quickly in warm weather. The laundry soured before it was ironed.
to become unpleasant or strained; worsen; deteriorate.
Relations between the two countries have soured.
to become bitter, disillusioned, or disinterested.
I guess I soured when I learned he was married.
My loyalty soured after his last book.
Agriculture. (of soil) to develop excessive acidity.
to make sour; cause sourness in.
What do they use to sour the mash?
to cause spoilage in; rot.
Defective cartons soured the apples.
to make bitter, disillusioned, or disagreeable.
One misadventure needn't have soured him. That swindle soured a great many potential investors.
having or denoting a sharp biting taste like that of lemon juice or vinegar Compare bitter
made acid or bad, as in the case of milk or alcohol, by the action of microorganisms
having a rancid or unwholesome smell
(of a person's temperament) sullen, morose, or disagreeable
(esp of the weather or climate) harsh and unpleasant
disagreeable; distasteful
a sour experience
(of land, etc) lacking in fertility, esp due to excessive acidity
(of oil, gas, or petrol) containing a relatively large amount of sulphur compounds
to become unfavourable or inharmonious
his marriage went sour
something sour
any of several iced drinks usually made with spirits, lemon juice, and ice
a whiskey sour
an acid used in laundering and bleaching clothes or in curing animal skins
First recorded before 1000; Middle English adjective and noun sure, soure, Old English adjective sūr; cognate with German sauer, Dutch zuur, Old Norse sūrr
If something is sour, it has a tangy or sharp flavor, like a lemon. Your brother may love the taste of limes, while they're way too sour for you. Sometimes this adjective is used to describe a fermented odor (the way milk smells when it goes bad), or a wrong note in music, or even a terrible mood: "Mom was acting so sour that I didn't even ask her if we could have pizza for dinner." Sour comes from the Old English sur, "sour, tart, or fermented."
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Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Picard thought of "Jaune Lemon" -- the French word for "yellow" -- but Ono's lawyers were sour on the idea, he said.
From Barron's • May 5, 2026
Canada primarily sells heavy, sour crude to the U.S., which is what U.S. refineries are built to process.
From MarketWatch • May 4, 2026
If Greek yogurt has a secret superpower, it’s this: it can step into almost any baking recipe that calls for sour cream, milk or even oil and do the job just as well.
From Salon • Apr. 28, 2026
In 2007, investments in risky US mortgages went sour as homeowners struggled to pay.
From BBC • Apr. 28, 2026
Fact: When life gave me sour lemons, I tried my best to make lemonade.
From "Sir Fig Newton and the Science of Persistence" by Sonja Thomas
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
