Karate match exchanges (4)
I believe the answer is:
bows
'karate match exchanges' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bows that I've seen before include "Bends from the waist deferentially" , "some people play with" , "Weapons" , "foreparts" , "Knots with two loops" .)