Decreising or Decreasing: How To spell?
The word Decreising is misspelled against Decreasing, an adjective meaning "Becoming less and less; diminishing."
Decreasing has vowels 'ea' together mispronounced as 'ei'Word contains consecutive vowels 'EA' in between alphabets decr & sing is misspelled as 'EI'
Wrong Spelling:  decr-ei-sing  Correct Spelling:  decr-ea-sing 
Find more wrongly spelled words of Decreasing to spell it well.