- 1tweak something to pull or twist something suddenly She tweaked his ear playfully.
- 2tweak something to make slight changes to a machine, system, etc. to improve it I think you'll have to tweak these figures a little before you show them to the boss.
NAmE//twik//Verb Forms present simple I / you / we / they tweak
he / she / it tweaks
past simple tweaked
-ing form tweaking