Cleave is it's own antonym. I just blew your mind.

@Thodsis

lol well sure. To cleave means both to separate and to adhere.

Cleave:
1: to divide by or as if by a cutting blow : SPLIT
2: to separate into distinct parts and especially into groups having divergent views

Or

Cleave: to adhere firmly and closely or loyally and unwaveringly

@Pikachu That'll help my next attempt at the cryptic crossword.

It also encourages a puerile giggle at the word 'cleavage'...

@Thodsis

lol yes. Good luck!

@rinkydinkydoink

That's a big dude