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Phrase(s): *hand in hand
1. Lit. holding hands. (*Typically: do something ~; sit ~; walk ~.) • They walked down the street hand in hand. • Bob and Mary sat there quietly, hand in hand. 2. Fig. [of two things] together, one with the other. (*Typically: go ~.) • Cookies and milk seem to go hand in hand. • Teenagers and back talk go hand in hand.
McGrawhill's American Idioms And Phrasal Verbs