give someone five—(coll.)
1. (also: give someone a hand) help a person:
- Hey, give me five over here for a minute, will ya?
2. slap smb.’s raised palm in greeting or as a congratulation:
- Reno put out his hand for me to give him five.
give someone high five— = give someone five 2:
- The guy at the door said goodnight and Billy turned around and gave him high five.
See also: take five / take the fifth.