Meaning of the word overhear in English

What does overhear mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

overhear

US /ˌoʊ.vɚˈhɪr/
UK /ˌəʊ.vəˈhɪər/

Verb

to hear (something or someone) without the knowledge of the speaker

Example:
I couldn't help but overhear their conversation.
She overheard them planning a surprise party.