Crossword Genius

Go silent (4,2)

Ross

I believe the answer is:

clam up

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go silent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for clam up that I've seen before include "'Fall silent and refuse to talk (4,2)'" , "Go silent" , "Stop giving out" , "Refuse to speak" , "Refuse to talk like large shellfish?" .)

I've seen this clue in the USA Today.
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