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1. To hide or store someone or something in a safe or secluded space. A noun or pronoun can be used between "tuck" and "away." He quickly tucked the winnings away inside his coat pocket, lest he draw unwanted attention to himself. I tucked away all the love letters your father used to write to me when we were young in a box somewhere in this wardrobe. Police have tucked the witness away in a safe house where the mobsters will never get to him.
2. To eat a large amount of food with a great, voracious appetite. A noun or pronoun can be used between "tuck" and "away." He tucked away three full helpings of Thanksgiving dinner before moving on to dessert. My, my, you sure can tuck quite a lot away, can't you?
Hidden, either intentionally or incidentally by elements in the surrounding area. The cabin is tucked away in a grove of trees, so you won't even be able to see it from the road. Don't worry about the gems—they've been safely tucked away.