flagger

American  

[flag-er] / ˈflæg ər /

noun

plural

flaggers

1. a person who holds a flag at the approach to a road construction site or other traffic obstruction and signals motorists to slow down or stop, or to proceed when it is safe to do so.

2. Often, trusted flagger. a person who monitors online content for a site, platform, company, etc., and identifies and reports any that is suspicious or does not comply with laws, rules, or guidelines.

3. a person on a racetrack who seeks to maintain a clear course for drivers, alerts them to any obstacle or adverse condition by means of a flag, and keeps race officials continuously informed of any such issues on the course.

4. a railway worker who uses a flag to signal train operators to stop when there is work being done on the track ahead.

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Example Sentences

Also subject to the ban were Anna-Lena von Hodenberg and Josephine Ballon of HateAid, a German organization that the State Department said functions as a trusted flagger for enforcing the DSA.

From Barron's • Dec. 23, 2025

"A flagger, I believe, is somebody trying to rekindle a bit of British pride," says Billy Cooper, a roofer from south-west London.

From BBC • Sep. 3, 2025

In Ventura County, no flagger does it better than Ventura High junior Ava Ortman, who is among the state leaders in touchdowns and is equally effective running the ball.

From Los Angeles Times • Oct. 17, 2024

“He was an omnivore, an orange-hanky flagger, an aficionado of all-you-can-eat buffets,” Lawlor writes of her shape-shifting protagonist.

From New York Times • Jun. 22, 2023

A young woman who works as a flagger on a highway crew gets picked up by a man when she waves him through with a mail truck coming the other way.

From Seattle Times • Dec. 2, 2017