Answer: steepens

AnswerCrossword Clue
STEEPENS

Increases in slope

STEEPENS

Gets harder to climb

STEEPENS

Ups a grade

STEEPENS
Grows precipitous.
STEEPENS
Becomes precipitous.
STEEPENSIncreases.
STEEPENSIncreases
STEEPENSGets more arduous, in a way
STEEPENSBecomes more inclined
STEEPENSRises exorbitantly, as prices
STEEPENSInclines more and more
STEEPENSIncreases inclination
STEEPENSIncreases in price