1. A failure to function for something mechanical, electrical, or electronic.
The car broke down, I will be late for the meeting.


2. Being emotionally upset.
The girl broke down when she got the exam results.


3. To divide into parts.
It's affordable if you break it down into monthly payments.
In chemistry, breakdown means a chemical decomposition. In other words, it is the separation of a single chemical compound into its elemental parts or to simpler compounds. Chemical breakdown is usually defined as the exact opposite of chemical synthesis.
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