streak

American  

[streek] / strik /

noun

1. a long, narrow mark, smear, band of color, or the like.

   streaks of mud.

2. a portion or layer of something, distinguished by color or nature from the rest; a vein or stratum.

   streaks of fat in meat.

3. a vein, strain, or admixture of anything.

   a streak of humor.

   Synonyms:

   trace, element, touch, cast

4. Informal.

   1. a spell or run.

      a streak of good luck.

   2. an uninterrupted series.

      The team had a losing streak of ten games.

5. a flash leaving a visible line or aftereffect, as of lightning; bolt.

6. Mineralogy. the line of powder obtained by scratching a mineral or rubbing it upon a hard, rough white surface, often differing in color from the mineral in the mass, and serving as an important distinguishing character.

7. Plant Pathology.

   1. an elongated, narrow, superficial lesion on stems or leaf veins, becoming brown and necrotic.

   2. any disease characterized by such lesions.

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verb (used with object)

1. to mark with a streak or streaks; form streaks on.

   sunlight streaking the water with gold; frost streaking the windows.

2. to lighten or color (strands of hair) for contrastive effect.

3. to dispose, arrange, smear, spread, etc., in the form of a streak or streaks.

   to streak cold germs on a slide for microscopic study.

verb (used without object)

1. to become streaked.

2. to run, go, or work rapidly.

3. to flash, as lightning.

4. to make a sudden dash in public while naked, especially as a prank.

idioms

1. blue streak. blue streak.

streak ¹ British  

/ striːk /

noun

1. a variant spelling of strake

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streak ² British  

/ striːk /

noun

1. a long thin mark, stripe, or trace of some contrasting colour

2. 1. (of lightning) a sudden flash

   2. ( as modifier )

      streak lightning

3. an element or trace, as of some quality or characteristic

4. a strip, vein, or layer

   fatty streaks

5. a short stretch or run, esp of good or bad luck

6. mineralogy the powdery mark made by a mineral when rubbed on a hard or rough surface: its colour is an important distinguishing characteristic

7. bacteriol the inoculation of a solid culture medium by drawing a wire contaminated with the microorganisms across it

8. informal an act or the practice of running naked through a public place

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verb

1. (tr) to mark or daub with a streak or streaks

2. (intr) to form streaks or become streaked

3. (intr) to move rapidly in a straight line

4. informal (intr) to run naked through a crowd of people in a public place in order to shock or amuse them

streak Scientific  

/ strēk /

1. The characteristic color of a mineral after it has been ground into a powder. Because the streak of a mineral is not always the same as its natural color, it is a useful tool in mineral identification.

2. A bacterial culture inoculated by drawing a bacteria-laden needle across the surface of a solid culture medium.

3. Also called streak plate

4. Any of various viral diseases of plants characterized by the appearance of discolored stripes on the leaves or stems.

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streak More Idioms  

1. see like greased lightning (a blue streak); talk someone's arm off (a blue streak); winning streak.

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Other Word Forms

• interstreak verb (used with object)
• streaked adjective
• streakedly adverb
• streakedness noun
• streaker noun
• streaklike adjective
• unstreaked adjective

Etymology

Origin of streak

First recorded before 1000; (for the noun) Middle English streke, akin to strike, Old English strica “stroke, line, mark”; cognate with German Strich, Gothic striks “stroke”; akin to Latin strigil strigil; (for the verb) late Middle English streken “to cross out,” derivative of the noun; cf. strike, stroke ¹

Explanation

A streak is a mark or characteristic. What makes you keep trying to wipe the streak of permanent marker off the white couch — your clean streak or your stubborn streak? Like a mark or stain, a streak in a person is a characteristic or strain that runs through them — like a mean streak. The noun streak can also refer to an unbroken chain of events — you’ll want a lucky streak to keep going and a losing streak to come to a quick end. As a verb, to streak means to dash, sometimes without clothes. If you talk a blue streak, you’ve got a lot to say, very quickly.

Example Sentences

Optimism around artificial intelligence is very much back, and the chips sector is on a generational winning streak.

From Barron's • Apr. 27, 2026

While the S&P 500 and the Nasdaq closed at new records on Friday, the Dow Jones Industrial Average ended the week down 0.4%, snapping a three-week winning streak.

From Barron's • Apr. 26, 2026

The WSJ Dollar Index fell 0.2%, snapping a three-trading-day winning streak.

From The Wall Street Journal • Apr. 25, 2026

As fans and pundits begin to predict City's downfall, Guardiola tinkers with his squad before a long winning streak results in his club being crowned Premier League champions.

From BBC • Apr. 25, 2026

Now that she knew what was really going on, her imagination had a dark streak in it.

From "The Marrow Thieves" by Cherie Dimaline

Related Words

• smear