ˈsound efˌfects noun [plural] sounds produced artificially for a radio or television programme, a film etc
[TahlilGaran] Dictionary of Contemporary English ▲
sound effects n. The noises made to imitate real sounds in a play, movie, or program.
Greg agreed to plan the sound effects for the class play. The movie was good but the sound effects were not very true to life. [TahlilGaran] English Idioms Dictionary ▲