A tweak is a small change or adjustment made to something.
When you hear someone say they've tweaked something, it usually means they've made a minor modification to fix or improve it. This can apply to anything from a recipe in the kitchen (they added an extra pinch of salt) to a piece of code on a computer (they fixed a small bug). A tweak is often used when talking about making adjustments or fine-tuning something, but not drastically changing it. For example, "I tweaked the design of this website" might mean they made some subtle changes to make it look better, rather than starting from scratch and rebuilding it entirely.
How common is "tweak"?
Word tweak is considered rare in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
noun
A sharp pinch or jerk; a twist or twitch.
Example: a tweak of the nose
A slight adjustment or modification.
Example: He is running so many tweaks it is hard to remember how it looked originally.
Trouble; distress; tweag.
A prostitute.
An additional input to a block cipher, used in conjunction with the key to select the permutation computed by the cipher.
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verb
To pinch and pull with a sudden jerk and twist; to twitch.
Example: to tweak the nose.
To adjust slightly; to fine-tune.
Example: If we tweak the colors towards blue, it will look more natural.
To twit or tease.
To abuse methamphetamines, especially crystal meth.
To exhibit symptoms of methamphetamine abuse, such as extreme nervousness, compulsiveness, erratic motion, excitability; possibly a blend of twitch and freak.
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.