Crossword Genius

Fire on all cylinders (3)

Ross

I believe the answer is:

hum

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fire on all cylinders</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for hum that I've seen before include "Drone - stink" , "Sound of busy activity" , "Reek" , "Stench" , "Buzz; stink" .)

I've seen this clue in The New York Times, the L.A. Times Daily and The Washington Post.
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