tuck

Fit snugly into.

“tuck your shirttail in”

Draw together into folds or puckers.

Make a tuck or several folds in.

“tuck the fabric”

“tuck in the sheet”

A straight sword with a narrow blade and two edges.

A narrow flattened pleat or fold that is stitched in place.

Eatables (especially sweets).

(sports) a bodily position adopted in some sports (such as diving or skiing) in which the knees are bent and the thighs are drawn close to the chest.