Crossword Genius

Hit friend's back (4)

Ross

I believe the answer is:

slap

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'hit' is the definition.
(both can mean to strike)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for slap that I've seen before include "Blow with open hand" , "Make-up (slang)" , "Hit with the palm" , "Right" , "Mild punishment" .)

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