watersignal
nounUK /ˈwɔːtəˌsɪɡnəl/
US /ˈwɔːtərˌsɪɡnəl/
A watersignal is a sign made with water, like a splash or a wave, that tells someone something.
The lifeguard used a watersignal to warn the swimmers to come back to shore.
OTHER MEANINGS
2. A light or marker placed on water to guide boats.
The boat followed the watersignal safely into the harbor.
3. A change in water, such as color or movement, that shows something is happening.
The fishermen watched the watersignal for signs of fish.
4. A message sent across water using splashes or waves.
The stranded sailors sent a watersignal to the rescue team.