Crossword Genius

Up-and-down, as a relationship (5)

Ross

I believe the answer is:

rocky

(Other definitions for rocky that I've seen before include "Unstable US mountain range?" , "likely to collapse" , "Unsteady, unstable" , "Characterised by large stones" , "Unstable - full of crags" .)

I've seen this clue in The New York Times.
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