Slope down (3)
I believe the answer is:
dip
(Other definitions for dip that I've seen before include "Pickpocket's" , "Dunk" , "Depression in a surface" , "An informal swim or a depression" , "Slope downwards" .)
I believe the answer is:
dip
(Other definitions for dip that I've seen before include "Pickpocket's" , "Dunk" , "Depression in a surface" , "An informal swim or a depression" , "Slope downwards" .)