Undersal or Undersail: How To spell?

The word Undersal is misspelled against Undersail, a verb meaning "To sail alongshore."

Word contains consecutive vowels 'AI' in between alphabets unders & l is misspelled as 'A'
Wrong Spelling:  unders-a-l 
Correct Spelling:  unders-ai-l 
Explore spell check of Undersail to spell without errors.

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