tuck

(transitive) To pull or gather up (an item of fabric).

(transitive) To push into a snug position; to place somewhere safe or somewhat hidden.

(intransitive, often with "in" or "into") To eat; to consume.

(ergative) To fit neatly.

To curl into a ball; to fold up and hold one's legs.

To sew folds; to make a tuck or tucks in.

To full, as cloth.

(LGBT, of a drag queen, trans woman, etc.) To conceal one’s penis and testicles, as with a gaff or by fastening them down with adhesive tape.

(when playing scales on piano keys) To keep the thumb in position while moving the rest of the hand over it to continue playing keys that are outside the thumb.

(aviation) Ellipsis of Mach tuck.