Spinning One's Thumbs Around Each Other
This page is the CodyCross answer for the clue below from Science Lab, Group 316, Puzzle 4 (Weigh Boats).
Question is: Spinning One's Thumbs Around Each Other
and the answer is: TWIDDLING
Word Meaning:
TWIDDLING — present participle and gerund of twiddle
Definitions from Wiktionary.