hotline

/HH AA1 T L AY0 N/
noun
  1. 1

    A telephone line that is always staffed and able to give immediate assistance.

    โ€œIf you've got any problems with the product, ring our hotline.โ€

  2. 2

    A direct line between two people, especially one between heads of state to be used in an emergency.

verb
  1. 1

    To communicate over a telephone hotline.

Source: https://en.wiktionary.org/wiki/hotline