steep·en 
(stēpən)
(stēpən)tr. & intr.v. steep·ened, steep·en·ing, steep·ens
To make or become steep or steeper.
- exteriorly
- exterminate
- extermination
- exterminative
- exterminator
- exterminatory
- extern
- external
- external auditory canal
- external capsule
- external-combustion engine
- external ear
- externalism
- externalist
- externality
- externalization
- externalize
- externally
- external phase
- external respiration
- externe
- externship
- exteroceptive
- exteroceptor
- exterritorial