Etymology
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passer-by (n.)

also passerby, 1560s, from agent noun of pass (v.) + by; earlier, this sense was in passager (see passenger).

updated on October 10, 2017

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Definitions of passer-by from WordNet

passer-by (n.)
a person who passes by casually or by chance;
Synonyms: passerby / passer
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.