Definition of signal verb from the Oxford Advanced American Dictionary

     

    signal

     verb
    verb
    NAmE//ˈsɪɡnəl//
     
    Verb Forms present simple I / you / we / they signal
     
    he / she / it signals
     
    past simple signaled ()signalled
     
    -ing form signaling ()signalling
     
     
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  1. 1 [intransitive, transitive] to make a movement or sound to give someone a message, an order, etc. Don't fire until I signal. Did you signal before you turned right? signal (to somebody) (for something) He signaled to the waiter for the check. signal to/for somebody to do something He signaled to us to join him. The police officer signaled for her to stop. signal somebody to do something She signaled him to follow. signal something The referee signaled a foul. signal (that)… She signaled (that) it was time to leave. signal which, what, etc… You must signal which way you are going to turn.
  2. 2[transitive] signal something to be a sign that something exists or is likely to happen synonym indicate This announcement signaled a clear change of policy. The scandal surely signals the end of his political career.
  3. 3 [transitive] to do something to make your feelings or opinions known signal something He signaled his discontent by refusing to vote. signal (that)… She signaled (that) she was willing to run for office.
See the Oxford Advanced Learner's Dictionary entry: signal