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steepen

1 ENTRIES FOUND:
steepen /ˈstiːpən/ verb
steepens; steepened; steepening
steepen
/ˈstiːpən/
verb
steepens; steepened; steepening
Britannica Dictionary definition of STEEPEN
: to become steep or steeper or to make (something) steep or steeper
[no object]
[+ object]