Crossword Genius

(Of terrain) going up and down (5)

Ross

I believe the answer is:

hilly

(Other definitions for hilly that I've seen before include "(Of a landscape) not flat" , "Like Chiltern or Cotswolds areas" , "Descriptive of undulating upland" , "Unlike flat land" , "Mountainous" .)

I've seen this clue in The Guardian.
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