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Become angry, often before flop (4)

Ross

I believe the answer is:

flip

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'flop' is the definition.
(thesaurus)

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(Other definitions for flip that I've seen before include "Not showing respect; turn over" , "Toss - impertinent" , "Toss over; egg-nog" , "hit the roof" , "Turn (over) - impudent" .)

I've seen this clue in The Mirror.
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