Crossword Genius

Exhortation to be optimistic (4-2)

Ross

I believe the answer is:

chin-up

(Other definitions for chin-up that I've seen before include "Have courage, elevate mandible" , "Remain cheerful - tilt head" , "Keep cheerful! (colloq.)" , "Show courage with elevated mandible" , "Remain cheerful, elevate mandible" .)

I've seen this clue in The Irish Times.
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