When the referee blows the whistle, he signals the players to stop.

The biologist recorded several unexpected signallings during the mating season.

The red flag signalizes danger to anyone approaching the cliff.

She signalized the end of the rehearsal by turning off the lights.

During the drill, the captain was signalizing the evacuation route with a flashlight so everyone could see where to go.

She signalled to the driver to stop when the children were crossing the road.

The sailors decoded the hidden signalls painted along the coastline to navigate safely at night.

During the emergency drill, the signalers coordinated traffic and guided the evacuees to safety.

The lifeguard was signaling swimmers to return to shore.

Cellular signaling is essential for coordinating development in multicellular organisms.