signal

/ˈsɪgnəl/ verb [I, T] (present participle UK signalling, past tense and past participle signalled, present participle US signaling, past tense and past participle signaled)

Definition

ACTION › to make a movement which gives information or tells people what to do: He signalled for them to be quiet. [+ to do sth] He signalled the driver to stop.

INTENTION › to show that you intend or are ready to do something: [+ (that)] The US signalled that they were ready to enter talks.

(Definition of signal verb from the Cambridge Learner's Dictionary © Cambridge University Press)