The phrase "a passersby" is not correct in written English.
The correct term is "passersby," which is a plural noun referring to people who are passing by a particular place.
Example: "The street was crowded with passersby, all eager to see the parade."
Alternatives: "bystanders" or "onlookers."
The incident was recorded by a passersby on their mobile phone and led to protests about the excessive use of force by police.
"Until the sheriff kicks us out," the bouncer told a passersby who asked how long they planned to stay in business.
We were met with a "welcome to Harlow," shouted by a passersby who noticed our photographer taking pictures.
The performance will be entirely silent to a passersby, but the audience will experience an complex and intimate concert.
The platform is open to anyone; a passersby can send in 15-second videos, identifying the musicians' names or the address where they spotted them, via email or by adding the hashtag #streetmusicmap on Facebook or Instagram.
If you don't have a phone with you, try to find a passersby or a nearby shop.
Half-a-dozen passersby were injured.
In the minutes that follow, she lies on the pavement, is hit by another driver, and is ignored by more than a dozen passersby, including a woman walking with a child.
A few blocks south, I heard cries in Spanish outside Blue Ruin, a dive bar where a few passersby huddled by the window to check the score.
The group was later joined by a few passersby as they walked around Connaught Place, finally sitting down for a discussion about the issues involved, at Central Park, where they were asked by the police to keep their placards away.
A few passersby said that they rarely thought about Extra Place but suggested that it could use some sprucing up.
