Definition of pell-mell adverb from the Oxford Advanced American Dictionary

 

pell-mell

 adverb
adverb
NAmE//ˌpɛl ˈmɛl//
 
(old-fashioned)
 
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very quickly and in a way that is not controlled The children rushed pell-mell down the stairs.
See the Oxford Advanced Learner's Dictionary entry: pell-mell