Word Study
passer-by
WORDNET DICTIONARY
Noun passer-by has 1 sense
- passer-by(n = noun.person) passer, passerby - a person who passes by casually or by chance; Array is a kind of footer, pedestrian, walker
CIDE DICTIONARY
passer-by, n.
One who passes by, especially casually or by chance; one not directly involved in some action; a passer. [1913 Webster]
For further exploring for "passer-by" in Webster Dictionary Online