listening watch

Noun

 * 1)  Continuous monitoring for incoming communications.
 * 2) * 1950,,  (UK title: A Town Like Alice), New York: William Morrow & Co., Chapter 10, p. 278,
 * “ It’s okay here if you want to close down your listening watch for tonight, Jackie. I’d like to have a listening watch in daylight hours tomorrow, from seven o’clock on. Is this Roger? Over.”

Translations

 * French: écoute permanente
 * Italian: ascolto continuo