Meaning of “breakdown” - Learner’s Dictionary

breakdown

noun [ C ] uk us /ˈbreɪkdaʊn/
ILLNESS (also nervous breakdown)

B2 a short period of mental illness when people are too ill to continue with their normal lives:

to have a breakdown
FAILURE

the failure or end of something such as communication or a relationship:

a breakdown in the peace talks
EXPLANATION

a short explanation of the details of something:

I need a breakdown of the costs involved.
NOT WORKING

B2 an occasion when a vehicle or machine stops working for a period of time

(Definition of “breakdown” from the Cambridge Learner’s Dictionary © Cambridge University Press)