1. 把…折入;把…塞进;把…掖好
If you tuck in a piece of material, you keep it in position by placing one edge or end of it behind or under something else. For example, if you tuck in your shirt, you place the bottom part of it inside your trousers or skirt.
2. 给（孩子）掖好被子；给…盖好被子
If you tuck a child in bed or tuck them in, you make them comfortable by straightening the sheets and blankets and pushing the loose ends under the mattress.