high-five

[ hahy-fahyv ]
/ ˈhaɪˈfaɪv /

noun

a gesture of greeting, good-fellowship, or triumph in which one person slaps the upraised palm of the hand against that of another.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for high five

high-five
/ slang /

noun

a gesture of greeting or congratulation in which two people slap raised right palms together

verb

to greet or congratulate (a person) in this way
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012