While waiting for the meeting to start, he idly traced the twiddling lines at the edge of his notepad.

The old helmsman absentmindedly fiddled with the twiddling line while the ship rode out the storm.

One twiddles one's thumbs while waiting for the interview to begin, barely suppressing the nerves.

It's common to twiddle one's thumbs while waiting in line.

One couldn't help twiddling one's thumbs during the long delay.

During the interminable board meeting, one twiddled one's thumbs and tried to look attentive.

Her twiddlesome habit of rolling the pen between her fingers made it hard to take her seriously.