Definition of steepen
English to English verb - become steeper
The mountain side has steepened.
source: WordNet 3.0 - make steeper
The landslides have steepened the mountain sides.
source: WordNet 3.0 - To become steep or steeper.
source: Webster 1913
Visual Synonyms 
Nearby Word
steepen, stephen, stepin, steven, stewpan, step-in, steuben, step on, stipend, step in, stew-pan, stephanion, stepmother, stupendous, stiffen, stave in, set upon, stepping-stone, stovain, stibine
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