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Phrase(s): hold something in [and] keep something in 1. [and] hold something inside ((of) one(self)); keep something inside ((of) one(self))
Fig. to keep one’s emotions inside oneself. • You really shouldn’t hold those feelings inside of you. • I have kept all this inside myself too long. • You shouldn’t hold in all that anger. 2. Lit. to hold in one’s stomach, gut, belly, etc. • Hold your belly in so you don’t look like a blimp. • Hold in your stomach.
McGrawhill's American Idioms And Phrasal Verbs