passer-by

UK: /ˌpɑːsə^rˈbaɪ/

Inflections of 'passer-by' (n): npl: passers-by (UK)

Collins Concise English Dictionary © HarperCollins Publishers::

passer-by noun (passers-by)

1. a person that is passing or going by, esp on foot

WordReference Random House Learner's Dictionary of American English © 2025

pass•er•by or pass•er-by /ˈpæsɚˈbaɪ, -ˌbaɪ/   n. [countable] , pl. pass•ers•by or pass•ers-by 

/ˈpæsɚzˈbaɪ, -ˌbaɪ/.  
1. a person passing by:
   A group of passers-by formed around the accident victim.

See -pass-¹.

WordReference Random House Unabridged Dictionary of American English © 2025

pass•er•by  (pas′ər bī′, -bī′, pä′sər-), n., pl. pass•ers•by 

(pas′ərz bī′, -bī′, pä′sərz-), 
1. a person passing by.

Also, pass′er-by′. 

• pass by + -er¹, with postposing of the particle 1560–70