Mising or Missing: How To spell?
The word Mising is misspelled against Missing, a verb meaning "Absent from the place where it was expected to be found; lost; wanting; not present when called or looked for."
Missing has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings mi & ing which should not be misspelled with single 'S'
Wrong Spelling:  mi-s-ing  Correct Spelling:  mi-ss-ing 
Find more wrongly spelled words of Missing to spell it well.