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English definition of “tuck”

tuck

verb [T always + adv/prep] (MAKE TIGHT)   /tʌk/
to push the ends clothing or material tightly into place: He tucked the sheet under the mattress. [M] Richard needs to tuck in his shirt. If you tuck part of your body, you hold it in a particular position: She sat with her legs tucked under her. [M] Tuck your tummy in.
(Definition of tuck verb (MAKE TIGHT) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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