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.

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

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

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

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

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

The knob-twiddlers in the studio spent hours perfecting the analog synth's warm tone.

The studio hired a seasoned knob twiddler to fine-tune the vintage amplifier before the session.

At the soundcheck, the knob twiddlers argued over who would tweak the EQ settings first.