Apper or Appair: How To spell?

The word Apper is misspelled against Appair, a verb meaning "To impair; to grow worse."

Word contains consecutive vowels 'AI' in between alphabets app & r is misspelled as 'E'
Wrong Spelling:  app-e-r 
Correct Spelling:  app-ai-r 
Explore spell check of Appair to spell without errors.

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