Stepen or Steepen: How To spell?
The word Stepen is misspelled against Steepen, a verb meaning "To become steep or steeper."
Steepen has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings St & pen which should not be misspelled with single 'E'
Wrong Spelling:  St-e-pen  Correct Spelling:  St-ee-pen 
Explore spell check of Steepen to spell without errors.