Definitions

1. verb

to move or play with something, especially with one’s fingers, in a careless or aimless way

“She twiddled the pen between her fingers while waiting for her friend to arrive.”

2. verb

to adjust or manipulate something, especially a screw or a control, in a small or fiddly way

“The mechanic had to twiddle the screw to get the engine to start correctly.”

3. noun

a small, fiddly adjustment or movement, especially of a screw or a control

“The twiddle on the engine’s valve caused it to run rough.”