Audio sweetening is a "catchall" phrase for fine-tuning sound in postproduction.
Sweeten/sweetener refer to subtly mixing an additional sound to a pre existing sound to "sweeten" the pre-existing sound. (As in sweets, sugar.)
For example in the film "Backdraft", the
sounds of wolves howling were faintly added to the sound of fire crackling
to sweeten and give it a haunting, animal like quality to it.
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