High-fives
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a greeting or an expression of admiration in which two people each raise a hand above their shoulder and bring the fronts of their hands together with force
High-fives meaning & definition 1 of High-fives.
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to give someone a high five (= a greeting or celebration in which two people each raise a hand and bring the fronts of their hands together with force) :
High-fives meaning & definition 2 of High-fives.