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tuck into (something)
1. To place or secure someone or something into some snug location. In this usage, a noun or pronoun can be used between "tuck" and "into." I tucked the card discretely into my pocket. Jimmy still can't fall asleep unless I tuck him into bed. I had to tuck my skirt into my waistband so it would get muddy while I crossed the swamp.
2. To commence eating a meal or some piece of food, especially with enthusiasm or gusto. I was so glad to tuck into my sandwich after the long, arduous hike up the mountain. I always get great satisfaction out of watching the whole family tuck into a meal I've prepared.
tuck into something
to begin eating something vigorously. The kids really tucked into the stew. I could see from the way that they tucked into their meal that they were really hungry.
Eat heartily or greedily, as in For a two-year-old he really tucked into his food. [Early 1800s]
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.