There are many synonyms that can be used in place of the phrase "give high five." Some of these include "slap hands," "exchange a high five," "high5," "palm slap," "celebrate with a high five," "up top," and "high-fiving." All of these phrases convey the same idea of two people hitting their hands together as a way of congratulating or showing excitement. Each synonym adds a unique flair to the simple act of giving a high five, making it a more fun and engaging experience for everyone involved. So next time you want to celebrate someone's success, try using one of these synonyms instead of the usual "give high five".