Meaning of the word "have a sharp tongue" in English

What does "have a sharp tongue" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

have a sharp tongue

US /hæv ə ʃɑrp tʌŋ/
UK /hæv ə ʃɑːp tʌŋ/
"have a sharp tongue" picture

Idiom

to tend to speak in a critical or sarcastic way

Example:
Be careful with her; she tends to have a sharp tongue.
Despite his kind appearance, the old man could sometimes have a sharp tongue.