twiddle one's thumbs

verb

to circle one's thumbs around one another, usually with the fingers interlaced, usually done idly while waiting or bored

She sat there twiddling her thumbs, waiting for the meeting to start.

意味（1）

to circle one's thumbs around one another, usually with the fingers interlaced, usually done idly while waiting or bored

意味（2）

(idiomatic) To wait or dawdle; to accomplish nothing useful or lack a useful occupation.