Tuck

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

a narrow flattened pleat or fold that is stitched in place

a straight sword with a narrow blade and two edges

fit snugly into

make a tuck or several folds in

draw together into folds or puckers