Crossword Genius

Blow friends up (4)

Ross

I believe the answer is:

slap

'blow' is the definition.
(I know that slap is a type of blow)

'friends up' is the wordplay.
'friends' becomes 'pals' (pal is a kind of friend).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'pals' backwards is 'SLAP'.

(Other definitions for slap that I've seen before include "Blow (in face, on back, wrist)" , "Strike with the palm" , "Strike action" , "Blow with open hand" , "Hit with an open hand" .)

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