v.1. To gather something up and fold or thrust it into something so as to secure or confine it: I wrote the number on a piece of paper and tucked it into my pocket.
2. To make someone secure in some bed for sleep, especially by tucking bedclothes into the bed: After the children put on their pajamas, I tucked them into bed.
3. Slang To begin to eat something heartily: We tucked into a stack of pancakes.