Crossword Genius

Make a strenuous effort (4,1,3)

Ross

I believe the answer is:

bust a gut

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make a strenuous effort</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for bust a gut that I've seen before include "Try really hard (slang)" , "Make a strenuous effort" , "Really work extra hard" , "Make a huge effort (slang)" , "Give it everything" .)

I've seen this clue in The Mirror.
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