English Reference
verb · noun

tweak

v. · n.
US /ˈtwik/ UK /twˈiːk/ tweak UK spelling tweaks

  1. 01 B2 Upper Intermediate Informal

    v.to make small changes to something so that it works better.

    v.to make fine-grained adjustments to a system, process, or object to improve performance or accuracy.

    Simple

    We just need to tweak the settings on the oven to get the cake right.

    In context

    The software engineers spent the weekend tweaking the algorithm to reduce latency during peak traffic hours.

    Usage

    Often used with 'the' followed by a specific setting or parameter.

    adjustfine tunemodify
  2. 02 C2 Proficiency American EnglishSlang

    v.to act very nervous or strange, often because of drugs.

    v.to exhibit extreme nervousness, excitability, or erratic behavior, typically associated with methamphetamine abuse.

    Simple

    He was tweaking in the corner, looking around like he was being followed.

    In context

    The suspect began tweaking during the interrogation, making it difficult for the officers to obtain a coherent statement.

    Teacher's tip

    This sense is highly informal and carries a strong negative association with drug culture; use with caution.

  3. 03 B2 Upper Intermediate Informal

    n.a small change made to improve something.

    n.a minor modification or adjustment intended to optimize a result.

    Simple

    With a few minor tweaks, the presentation will be ready for the client.

    In context

    The designer suggested a few aesthetic tweaks to the layout to make the interface more intuitive for new users.

This year's vaccine has had a few tweaks, including one to better match subclade K.

BBC News· 31 Aug 2026

From Middle English twikken, from Old English twiccian (“to pluck”), from Proto-West Germanic *twekkōn (“to fasten; clamp; pinch”). Related to twitch. The drug-related sense may be a blend of twitch and freak.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin gmw-pro *twekkōn
Level B2 · Upper Intermediate
Frequency Frequent
Updated