Crossword Genius

"I'm frustrated!" (4)

Ross

I think it could be either:

sigh

argh

(Other definitions for sigh that I've seen before include "Deep breath expressing regret, weariness etc" , "Exhale sadly" , "Weary exhalation" , "Exhale resignedly" , "Breathe heavily" .)

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