noun. pass· er· by ˌpa-sər-ˈbī. ˈpa-sər-ˌbī. plural passersby ˌpa-sərz-ˈbī. ˈpa-sərz-ˌbī. : one who passes by. A passerby saw the accident and offered to help. Examples of passerby in a Sentence. A passerby saw the accident and stopped to help. Passersby were asked if they were registered to vote. Recent Examples on the Web. More @Wikipedia
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