Crossword Genius

Invalidate (5)

Ross

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<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">invalidate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for rebut that I've seen before include "Deny claim" , "Brute (anag)" , "Rebuff; deny" , "Overturn" , "Confute" .)

I've seen this clue in the Penny Press, The Telegraph, The Wall Street Journal, the Sydney Morning Herald, the Universal, the Newsday and The Guardian.
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