flagsignal
nounUK /ˈflæɡˌsɪɡnəl/
US /ˈflæɡˌsɪɡnəl/
A flag signal is a message you send by waving or showing a flag.
The sailor used a flag signal to tell the other boat to stop.
RELATED WORDS
OTHER MEANINGS
2. A small flag or light used to warn people of danger.
The guard raised a flag signal to warn cars about the broken bridge.
3. A sign or hint that something is happening.
Her frown was a flag signal that she was unhappy.
4. A system of sending messages using flags held in different positions.
Scouts learn flag signal to talk across a field without shouting.