Crossword Genius

Rower or butterfly, say (6)

Ross

I believe the answer is:

stroke

I believe this is a double definition.

'rower' is the first definition.
(term for a rower)

'butterfly say' is the second definition.
(butterfly is a kind of stroke)

'or' is the link.

(Other definitions for stroke that I've seen before include "Attack of apoplexy" , "butterfly?" , "Mark made by brush" , "Brain haemorrhage or caress" , "A blow or brain seizure" .)

I've seen this clue in The Mirror and The Daily Express.
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