something you hear1 [countable] something that you can hear
Synonymnoisea high/low sounda clicking/buzzing/scratching, etc. soundthe different sounds and smells of the forestShe heard the sound of footsteps outside.He crept into the house trying not to make a sound.2 [uncountable] continuous rapid movements (called vibrations) that travel through air or water and can be heard when they reach a person's or an animal's earSound travels more slowly than light.
from television/radio3 [uncountable] what you can hear coming from a television, radio, etc, or as part of a film/movieCould you turn the sound up/down?The sound quality of the tapes was excellent.
of musicians4 [countable, uncountable] the effect that is produced by the music of a particular singer or group of musiciansI like their sound.
impression5 [singular] the sound of something the idea or impression that you get of somebody/something from what somebody says or what you readThey had a wonderful time by the sound of it.From the sound of things you were lucky to find him.They're consulting a lawyer? I don't like the sound of that.
water6 [countable] (often in place names) a narrow passage of water that joins two larger areas of water
like, etc. the sound of your own voice(disapproving) to like talking a lot or too much, usually without wanting to listen to other peopleShe's much too fond of the sound of her own voice.
Usage note: noise / soundNoise is usually loud and unpleasant. It can be countable or uncountable:Try not to make so much noise. ◇ What a terrible noise!Sound is a countable noun and means something that you hear:All she could hear was the sound of the waves. You do not use words like much or a lot of with sound.