Englishfor English speakers
listening
—
noun
(= hearing)
the act of hearing attentively
you can learn a lot by just listening
they make good music--you should give them a hearing
sonar
—
noun
(= asdic)
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
sonar is an acronym for sound navigation ranging
asdic is an acronym for antisubmarine detection investigation committee