tapsignal
nounUK /ˈtæpˌsɪɡnəl/
US /ˈtæpˌsɪɡnəl/
A tap signal is a message you send by tapping, like knocking on a door.
The scout used a tap signal on the tree to tell his friends he was there.
RELATED WORDS
OTHER MEANINGS
2. A pattern of light taps used to communicate secretly.
The prisoners sent a tap signal through the wall.
3. A sound made by tapping that tells someone to do something.
She gave a tap signal on the table to start the game.
4. A signal made by tapping a device, such as a phone or drum.
He sent a tap signal on the drum to call everyone together.