tucking

(verb) fit snugly into. Synonyms: tuck, insert. Examples: "Insert your ticket into the slot." "Tuck your shirttail in."

(verb) make a tuck or several folds in. Synonyms: tuck. Examples: "Tuck the fabric." "Tuck in the sheet."

(verb) draw together into folds or puckers. Synonyms: gather, pucker, tuck.