Verb > Tweak
1 : to change (something) slightly in order to improve it : to make small adjustments to (something)
The company may have to tweak (=adjust) its image.
Our software developers are tweaking (=fine-tuning) the program.
We just wanted to tweak his original idea a bit.
2 : to injure (a part of your body) slightly
He tweaked his ankle playing soccer.
3 : to pinch and pull (something) with a sudden movement
My brother hates it when our grandmother tweaks his cheek.
4 : chiefly US : to criticize or make fun of (someone or something)
His friends tweaked (=teased) him for gaining weight.