Definition from macmillandictionary.com
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The cyclist signalled and turned right.
He signalled frantically across the room to his wife.
The driver signalled her to cross the road.
He flashed his torch to signal that he was ready.
This agreement signalled the end of the war.
The new tax signalled that the government was serious about the environment.
The kidnappers have signalled their willingness to negotiate.
Both parties have signalled their determination to win.