Etymology
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pell-mell (adv.)

"confusedly; in an impetuous rush; with indiscriminate violence, energy, or eagerness," 1570s, from French pêle-mêle, from Old French pesle mesle (12c.), apparently a jingling rhyme on the second element, which is from the stem of the verb mesler "to mix, mingle" (see meddle). The phonetic form pelly melly is attested in English from mid-15c.

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Definitions of pell-mell
1
pell-mell (adv.)
in a wild or reckless manner;
running pell-mell up the stairs
Synonyms: harum-scarum
2
pell-mell (adj.)
with undue hurry and confusion;
a pell-mell dash for the train
Synonyms: helter-skelter
From wordnet.princeton.edu