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English definition of “sound”

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sound

noun uk   /saʊnd/ us  

sound noun (NOISE)

A2 [C or U] something that you can hear or that can be heard: They could hear the sound of a bell tolling in the distance. She stood completely still, not making a sound. Suddenly we heard a loud knocking sound from the engine. Sound can travel over very large distances in water. [U] the activity of recording and broadcasting sound such as from a performance of music or for a film: a sound engineer/recording [U] the volume or quality of the sound of a television or film: Could you turn the sound down/up on the TV? [C] the particular quality of the music that a musician or a group of musicians produce: The band's sound is a distinctive mixture of funk and rap.
More examples

sound noun (SEEM)

the sound of sth C2 [S] how something seems to be, from what is said or written: I like the sound of the beef in red wine sauce. By/From the sound of it I don't think it was her fault. So I'm going to be talking to over 90 people, am I? I don't like the sound of that!

sound noun (WATER PASSAGE)

[C] a passage of sea connecting two larger areas of sea, or an area of sea mostly surrounded by land: the Kalmar Sound

sound

verb uk   /saʊnd/ us  

sound verb (SEEM)

sound good, interesting, strange, etc.
More examples
A2 to seem good, interesting, strange, etc. from what is said or written: Your job sounds really interesting. I know it sounds silly, but I'll miss him when he's gone.
sound like/as if/as though B1 to seem like something, from what is said or written: That sounds like a good idea. It sounds like you've got a sore throat. It sounds as if they had a good holiday. You're going skiing with three friends? That sounds like fun.sound angry, happy, rude, etc. B2 to seem angry, happy, rude, etc. when you speak: He sounded very depressed when we spoke on the phone yesterday. At the press conference, he sounded at his most relaxed.

sound verb (NOISE)

[I or T] to make a noise: If the alarm sounds, leave the building immediately. It sounds like a bird. He sounds (= speaks) just like someone I used to work with. Sounding the car's horn, she drove at high speed through the crowded streets.sound the alarm to cause a noise to be made or say or shout a message to warn people about something: Quick, sound the alarm - there's a fire in the machine room!

sound verb (WATER DEPTH)

[T] to measure the depth of a mass of water, such as the sea, usually by sonar
See also
Phrasal verbs

sound

adjective uk   /saʊnd/ us  

sound adjective (GOOD CONDITION)

not broken or damaged; healthy; in good condition: It's an old building but it's still structurally sound. Considering his age, his body is quite sound. Was she of sound mind (= not mentally ill) at the time of the incident?

sound adjective (GOOD JUDGMENT)

showing good judgment; able to be trusted: She gave me some very sound advice. Are these pesticides environmentally sound (= will they not damage the environment)? Government bonds are a sound investment.

sound adjective (COMPLETE)

complete: How sound is her knowledge of the subject?

sound

adverb, adjective [before noun] uk   /saʊnd/ us  
(of sleep) deep and peaceful: He was sound asleep within moments of getting into bed.
(Definition of sound from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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