hiddensignal
nounUK /ˈhɪd.ən ˈsɪɡ.nəl/
US /ˈhɪd.ən ˈsɪɡ.nəl/
A hidden signal is a secret sign that tells you something is happening.
The blinking light was a hidden signal that the game had started.
OTHER MEANINGS
2. A faint electronic pulse that is hard to notice but carries information.
The radio picked up a hidden signal from far away.
3. A subtle behavior that shows how someone truly feels.
Her smile was a hidden signal that she was happy.
4. A private warning shared only with certain people.
The whistle was a hidden signal for the team to run.