semaphore flag
nounUK /ˈseməfɔː flæɡ/
US /ˈseməfɔːr flæɡ/
A small flag that a person waves to send messages to someone far away.
The sailor used a semaphore flag to signal the other boat.
RELATED WORDS
OTHER MEANINGS
2. A flag used in the semaphore system of signaling with two flags held in different positions.
Each semaphore flag position stands for a different letter.
3. A cloth marker used to warn people, such as near a railway or road.
The worker raised a semaphore flag to stop the train.
4. Any flag used to pass information visually over a distance.
Scouts learn to read messages sent with a semaphore flag.