Overstren or Overstrain: How To spell?

The word Overstren is misspelled against Overstrain, a verb meaning "To strain one's self to excess."

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

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