The word Gibing is misspelled against Gibbing, which is present continuous of "Gib"
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Gibbing has double "bb" is mispronounced as "b"
Remember double 'BB' in between the strings Gi & ing which should not be misspelled with single 'B'
Wrong Spelling:  Gi-b-ing 
Correct Spelling:  Gi-bb-ing 
Find more wrongly spelled words of Gibbing to spell it well.