tuck definition

1. eatables (especially sweets)
2. (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
3. a narrow flattened pleat or fold that is stitched in place
4. fit snugly into
• examples: insert your ticket into the slot
• examples: tuck your shirttail in
5. make a tuck or several folds in
• examples: tuck the fabric
• examples: tuck in the sheet