twiddle

(noun) a series of small (usually idle) twists or turns.

(verb) turn in a twisting or spinning motion. Synonyms: twirl, swirl, whirl. Example: "The leaves swirled in the autumn wind."

(verb) manipulate, as in a nervous or unconscious manner. Synonyms: fiddle with. Example: "He twiddled his thumbs while waiting for the interview."