break down

Short definition: The phrase break down means to stop functioning properly, especially for machines or vehicles, or to lose emotional control, often describing mechanical failure or a sudden release of strong feelings.

Looking for a clear and natural explanation of the phrasal verb break down? This phrase is extremely common and can describe emotional moments, mechanical problems, communication issues, or even explaining something step by step. The meaning depends heavily on context, but it usually suggests something stopping, failing, collapsing, or being separated into smaller parts. Below are detailed meanings with realistic examples so you can clearly understand how break down is used in everyday English.

Forms: break down, breaks down, broke down, broken down, breaking down
Related: breakdown n., failure n., collapse n., analyze v.
Syllable: break-down

1. (Verb) To stop working properly, especially for machines or vehicles.

   When something mechanical breaks down, it stops functioning the way it should. This is commonly used for cars, computers, appliances, or systems that suddenly fail. It usually implies inconvenience and the need for repair.

   My car broke down on the highway, and I had to wait two hours for roadside assistance.
   The air conditioner broke down during the hottest day of the summer.
   If the system breaks down again, we’ll need to replace it completely.

   Synonyms: stop working, malfunction, fail, crash, collapse mechanically, short-circuit, shut down unexpectedly, stall, give out, go dead, cease functioning, develop a fault
   Antonyms: function properly, run smoothly, operate well, perform correctly, work efficiently, stay operational, continue running, stay intact, remain stable, hold up, operate normally, stay reliable

2. (Verb) To lose emotional control and begin crying or reacting strongly.

   When a person breaks down, it usually means they can no longer hold back strong emotions. They may start crying, shaking, or speaking in an emotional way. This meaning often appears in stressful, overwhelming, or heartbreaking situations.

   She broke down in tears after hearing the unexpected news.
   He tried to stay strong during the speech, but he eventually broke down while thanking his family.
   After weeks of pressure, she finally broke down and admitted she needed help.

   Synonyms: burst into tears, lose control emotionally, collapse emotionally, cry uncontrollably, fall apart, give way emotionally, melt down, sob, crack under pressure, unravel, lose composure, become overwhelmed
   Antonyms: stay composed, keep calm, remain steady, hold it together, stay strong, maintain control, stay balanced, remain collected, keep emotions in check, remain firm, stay resilient, stay stable

3. (Verb) To divide something into smaller parts in order to understand or explain it.

   To break down information means to separate it into simpler pieces so it becomes easier to understand. This meaning is very common in teaching, analysis, or presentations, where complex ideas need to be clarified step by step.

   The teacher broke down the math problem into smaller steps so everyone could follow.
   Let me break it down for you so the process makes more sense.
   The report breaks down the costs by department and category.

   Synonyms: analyze, explain step by step, dissect, simplify, divide into parts, outline clearly, clarify, detail, deconstruct, categorize, organize logically, itemize
   Antonyms: combine, summarize briefly, generalize, merge together, complicate, confuse, blur details, mix up, conceal details, obscure meaning, lump together, oversimplify vaguely

4. (Verb) To stop functioning effectively, especially in communication or relationships.

   Communication or systems can also break down when people stop understanding each other. It suggests failure in cooperation, clarity, or trust. This meaning often appears in workplace, political, or relationship contexts.

   Negotiations broke down after both sides refused to compromise.
   Their relationship began to break down because they stopped communicating honestly.
   When communication breaks down, small misunderstandings can turn into major conflicts.

   Synonyms: fail, collapse, fall apart, deteriorate, unravel, disintegrate, weaken, decline, crumble, break apart socially, dissolve, falter
   Antonyms: improve, strengthen, recover, rebuild, repair, restore, reconcile, stabilize, thrive, succeed, function well, progress

5. (Verb) To physically separate into smaller pieces or decompose naturally.

   In scientific or natural contexts, break down can describe materials separating into smaller parts, such as food being digested or substances decomposing. It often suggests gradual change rather than sudden failure.

   The body breaks down food into nutrients that it can absorb.
   Plastic takes many years to break down in the environment.
   Enzymes help break down complex molecules into simpler forms.

   Synonyms: decompose, decay, dissolve, disintegrate physically, degrade, separate, split apart, fragment, erode, digest, reduce chemically, break apart naturally
   Antonyms: build up, construct, assemble, combine, unite, solidify, strengthen structure, bond together, reinforce, accumulate, preserve, maintain structure