Definition from macmillandictionary.com
Your browser doesn’t support HTML5 audio
We waited for them to give us the signal to move.
He gave a signal to his driver to carry on.
At the prearranged signal, we all jumped up and shouted ‘Surprise!’
They waved a flag as a signal of distress.
She knew she was sending him mixed signals.
sailors practising their semaphore signals
They had ignored the strong signals of an approaching economic crisis .
The election was a signal for the party to rethink its strategies.
In terms of their personal relationships, teachers have to be very careful not to send students the wrong signals.
When she told him she was leaving, Bill wasn’t surprised – he had read the signals.
The copper wire carries the electrical signals.
The signal was at green.