英和和英

an emergency signal

a distress signal

a warning-signal

signal to turn the lights out

a nautical signal

a flashing-light signal

signals communicated through gestures

to heliograph （a message）

communicate by [through, with] signs

send (out) a mayday (signal)

a danger-signal

a go‐ahead signal

a fog-signal

pick up signals

signal to wake up

receive a signal

a storm signal

in a signal manner

jump the light

as a signal

wait for the light to change

pick up a signal

distortion that occurs when the output signal does not have a linear relation to the input signal

a signal for attracting attention

convey by semaphore, of information

the signal to stop

a signal man

a railroad signal called distant signal

the audible part of a transmitted signal

flash a signal