steepen

verb steep·en \ˈstē-pən, -p^əm\

: to become steep or steeper or to make (something) steep or steeper

steep·enedsteep·en·ing \ˈstē-pə-niŋ, ˈstēp-niŋ\

Full Definition of STEEPEN

intransitive verb

: to become steeper

transitive verb

: to make steeper

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1847

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