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Pronunciation varies by accent · noun
The effect of sound that is picked up by the telephone's mouthpiece and introduced (at low level) into the earpiece of the same handset, acting as feedback; or a similar effect in radiotelegraphy, public-address systems, etc..
Use side tone when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Side tone means The effect of sound that is picked up by the telephone's mouthpiece and introduced (at low level) into the earpiece of the same handset, acting as feedback; or a similar effect in radiotelegraphy, public-address systems, etc..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use side tone where its definition matches the intended context.
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