Crossword Genius

(This is like watching paint dry!) (4)

Ross

I believe the answer is:

yawn

(Other definitions for yawn that I've seen before include "Show one is tired or bored" , "Open mouth wide" , "Show boredom" , "Sleepy gape" , "Involuntary sign of tiredness or boredom" .)

I've seen this clue in the Universal.
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