Answer: twiddle

AnswerCrossword Clue
TWIDDLE

Rotate lightly

TWIDDLE

Play lightly with

TWIDDLE

Move about absently, as one's thumbs

TWIDDLE
Tinker
TWIDDLE
Turn about
TWIDDLEMove one's thumbs idly
TWIDDLE... one's thumbs
TWIDDLEThing to do with one's thumbs