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English definition of “signal”

signal

verb [I or T] (ACTION)    /ˈsɪɡ.nəl/ (-ll- or US usually -l-)
C2 to make a movement, sound, flash, etc. that gives information or tells people what to do: Flashing lights on a parked car usually signal a warning (to other motorists). He signalled left, and turned the lorry slowly. He was signalling (= giving a signal) with a red flag. She signalled for help. [+ that] She signalled to the cars behind that they were going the wrong way. [+ obj + to infinitive ] The children's mother signalled them to be quiet. [+ to infinitive] The children's mother signalled to/for them to be quiet.Communicating and keeping in touch
(Definition of signal verb (ACTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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