passer-by

plural passers-by · alternative passerby

1. A person who is passing by (that is, walking past).

   When he tripped and fell in the street, several kind passers-by helped him up.

   1 more example

   With a little manœuvring they contrived to meet on the doorstep which was […] in a boiling stream of passers-by, hurrying business people speeding past in a flurry of fumes and dust in the bright haze.

   1963, Margery Allingham, chapter 10, in The China Governess: A Mystery, London: Chatto & Windus, →OCLC

   Synonyms: passer