Meaning of the word "mental breakdown" in English

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

mental breakdown

US /ˈmɛntəl ˈbreɪkˌdaʊn/
UK /ˈmɛntl̩ ˈbreɪkˌdaʊn/

Noun

a period of mental illness or great emotional distress during which one is unable to function in daily life

Example:
After losing his job and his home, he suffered a complete mental breakdown.
The stress of the exams almost led to a mental breakdown for her.