Tweak meaning

twēk
To tweak is to twist sharply, or to make small adjustments to something in order to improve it.

When you twist someone's nose, this is an example of tweak.

When you make small adjustments to a car's engine to make it run optimally, this is an example of tweak.

verb
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The definition of a tweak is a small adjustment made to something in order to improve it.

A small adjustment made to the engine of a car to make it run better is an example of a tweak.

noun
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To pinch, pluck, or twist sharply.

Tweaked her sister's ear.

verb
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To give a sudden, twisting pinch to (someone's nose, ear, cheek, etc.)
verb
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To adjust or modify slightly, so as to improve performance, efficiency, etc.; fine-tune.
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Such a pinch.
noun
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A minor adjustment or modification.
noun
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To adjust; fine-tune.

Tweaked her computer setup.

verb
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To make fun of; tease.
verb
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To behave in an agitated or compulsive manner, especially when under the influence of a stimulant drug.
verb
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To be under the influence of a stimulant drug, especially methamphetamine.
verb
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A sharp, twisting pinch.
noun
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A small adjustment.

Made a few tweaks to the sound system.

noun
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A teasing remark or action; a joke.
noun
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To make minor adjustments in an electronic system or in a software program in order to improve performance. See calibrate and death by tweakage.
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A sharp pinch or jerk; a twist or twitch.

A tweak of the nose.

noun
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noun
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A slight adjustment or modification.

He is running so many tweaks it is hard to remember how it looked originally.

noun
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To pinch and pull with a sudden jerk and twist; to twitch.

To tweak the nose.

verb
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(informal) To adjust slightly; to fine-tune.

If we tweak the colors towards blue, it will look more natural.

verb
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To twit or tease.
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(intransitive, US, slang) To abuse methamphetamines, especially crystal meth.
verb
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(intransitive, US, slang) To exhibit symptoms of methamphetamine abuse, such as extreme nervousness, compulsiveness, erratic motion, excitability; possibly a blend of twitch and freak.
verb
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(intransitive, US, slang) To exhibit extreme nervousness, evasiveness when confronted by law enforcement or other authority (e.g., customs agents, border patrol, teacher, etc.), mimicking methamphetamine abuse symptoms.
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Origin of tweak

Probably variant of dialectal twick from Middle English twikken from Old English twiccian