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steepen

verb
 
 
/ˈstiː.pən/

Definition

[I or T] to become steeper, or to make something do this: The trail began to steepen near the top of the hill.Slanting, sloping, leaning, tilting [I] If something such as a cost steepens, it increases: Our costs have steepened since we began this project.Value and price increases
(Definition of steepen verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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