Crossword Genius

Express disapproval (3)

Ross

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<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">express disapproval</span>' is the definition.<br/ ><span class="explanation-format__explanation">(as in a crowd booing)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for boo that I've seen before include "Expression of disapproval" , "causing surprise!" , "Surprising exclamation" , "Shout of dislike" , "Startling utterance" .)

I've seen this clue in The Telegraph, The Sun, The Guardian, the Evening Standard and The Independent.
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