When you reduce a process, situation, problem, plan, or idea to its basic parts to make it easier to understand, you break it down.
When you use force to go through a door that is locked, you break it down.
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1. To cause to fall or collapse.
2. To collapse due to fatigue, an illness, or a sudden attack; SYN. collapse.
3. To fail to operate correctly; to break.
4. To lose control of one's emotions; SYN. lose it.
5. To make ineffective; SYN. crush.
6. When something decomposes or reduces to its smallest parts or is reduced by someone to its smallest parts, it breaks down.
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break-dancer · break dancing · break diplomatic relations · breakdown · break down · break down a door · breakdown lorry · breakdown region · breakdowns · breakdown service · breakdown van