A brief, small (sometimes involuntary) movement out of place and then back again; a spasm. / (informal) Action of spotting or seeking out a bird, especially a rare one.

(intransitive) To perform a twitch; spasm. / (transitive) To cause to twitch; spasm. / (transitive) To jerk sharply and briefly. / (obsolete) To exert oneself.

couch grass (Elymus repens; a species of grass, often considered as a weed)

(literary) betwixt, between

The sound of a succession of chirps as uttered by birds. / A tremulous broken sound. / A slight trembling of the nerves.

(intransitive) To utter a succession of chirps. / (intransitive, transitive) (of a person) To talk in an excited or nervous manner. / To make the sound of a half-suppressed laugh; to titter; to giggle.

(idiomatic) To reconsider, use judgement; to proceed with caution or thought.

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

(transitive) To wiggle, fidget or play with; to move around. / (transitive, computing) To flip or switch two adjacent bits (binary digits).

A slight twist with the fingers. / A wiggling movement. / A small decorative embellishment. / A small musical flourish. / A tilde. / A drawn line that is curvy or twisted. / A tiny bit / A tizzy