also: あくした
noun
evil tongue; gossip; slanderous talk
Refers to malicious or slanderous speech; somewhat literary or formal. The reading あくした is rare.
彼の悪舌にはもう慣れた。
I've gotten used to his malicious gossip.
悪舌をふるう人は信用できない。
You can't trust someone who speaks with an evil tongue.
Compound of 悪 (evil) and 舌 (tongue), literally 'evil tongue'. The reading あくした is a rare variant.