When the commander gives the signal, the soldiers will charge the hill.
John wasn't sure whether the woman at the next table was giving him signals or not.
The diver's signal for being out of air is a finger drawn across the throat.
WordNet 3.0 Sense Numbers: 1
The weak credit markets were another signal of the troubled economy.
These yellow needles on your hemlock tree are a signal of stress.
The data give confusing signals about a discernible trend in temperature change.
WordNet 3.0 Sense Numbers: 2
Radio signals travel at the speed of light.
The signal from the T.V. station is coming in loud and clear.
These relays boost the signal as it is carried over hundreds of miles.
WordNet 3.0 Sense Numbers: 3
John braked at the intersection as the traffic signal turned red.
The engineer saw the green signal ahead on the tracks, indicating it was safe to go.
Trains were delayed due to a malfunctioning signal along the commuter tracks.
WordNet 0.0 Sense Numbers: 1c