steepen

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From steep + -en. Compare Old English stīepan (“to steepen”).

And ever it narrows and deepens and splashes higher against the rocks which stem its current; forever it is steepening to the plunge. — The Book of the National Parks, Robert Sterling Yard
At the first outset, heavy, miry ground and a matted, marish vegetation greatly delayed our progress; but by little and little the hill began to steepen and become stony under foot, and the wood to change its character and to grow in a more open order. — Treasure Island, Robert Louis Stevenson

Type a word, a sentence, a book title, or a link to an English article. WordNet and the Classics answer.

Try

A library of classics · a vault of words · instant etymology & meaning