PASSERBY Meaning of PASSERBY in English pass ‧ er ‧ by /ˌpɑːsəˈbaɪ $ ˌpæsər-/ BrE AmE noun ( plural passersby ) [countable] someone who is walking past a place by chance:They sell drinks to passersby. Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012