tuck

verb

• 1 [with object] push, fold, or turn (the edges or ends of something, especially a garment or bedclothes) so as to hide them or hold them in place:he tucked his shirt into his trousers
• (tuck someone in) make someone, especially a child, comfortable in bed by pulling the edges of the bedclothes firmly under the mattress:he carried her back to bed and tucked her in
• draw (something, especially part of one’s body) together into a small space:she tucked her legs under her
• put (something) away in a specified place or way so as to be hidden, safe, comfortable, or tidy:the colonel was coming toward her, his gun tucked under his arm

• 2 [with object] make a flattened, stitched fold in (a garment or material), typically so as to shorten or tighten it, or for decoration.

noun

• 1a flattened, stitched fold in a garment or material, typically one of several parallel folds put in a garment for shortening, tightening, or decoration:a dress with tucks along the bodice
• [usually with modifier] informal a surgical operation to reduce surplus flesh or fat:a tummy tuck

• 2British informal food, typically cakes and candy, eaten by children at school as a snack: [as modifier]:a tuck shop

• 3 (also tuck position) (in diving, gymnastics, downhill skiing, etc.) a position with the knees bent and held close to the chest, often with the hands clasped around the shins.