The word Clateringly is misspelled against Clatteringly, an adverb meaning "With clattering."
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Clatteringly has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings cla & eringly which should not be misspelled with single 'T'
Wrong Spelling:  cla-t-eringly 
Correct Spelling:  cla-tt-eringly 
Find more wrongly spelled words of Clatteringly to spell it well.