Crossword Genius

signaled fatigue (6)

Ross

I believe the answer is:

yawned

(Other definitions for yawned that I've seen before include "Gave mute oral sign of boredom" , "Gaped, with tiredness?" , "Showed tiredness or boredom" , "Demonstrated tiredness (or boredom!)" , "Showed that one was tired" .)

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