English Reference

Word

meltdown

Phoneticsmelt·down

US/ˈmɛɫtˌdaʊn/

UK/mˈɛltdaʊn/

Definitions

01nuclear failure

B2 · Science

n. a very dangerous accident where the center of a nuclear power plant gets too hot and melts.

n. the melting of a nuclear reactor core due to a failure of the cooling system, often leading to the release of radiation.

“The safety systems prevented a total meltdown after the earthquake damaged the power plant.”

“Engineers worked around the clock to prevent a full-scale meltdown, as the rising temperatures in the reactor core threatened the containment structure.”

Technical

Usage

Often used with 'nuclear' or 'reactor'.

Synonyms

nuclear accidentcore melt

02emotional outburst

B2 · Psychology

n. a sudden loss of control over your feelings, often involving crying or shouting because of too much stress.

n. an episode of intense emotional distress or a loss of self-control, frequently triggered by overwhelming stress or sensory overload.

“The toddler had a complete meltdown in the supermarket because he couldn't have the toy.”

“After weeks of working overtime without a break, he suffered a public meltdown during the board meeting.”

Informal

Teaching tip

While often used for children's tantrums, in a psychological context it specifically describes an involuntary response to being overwhelmed.

03economic or systemic crash

C1

n. a sudden and complete failure of a system, like the stock market or a large company.

n. a sudden, disastrous collapse of a financial or social system.

“The global financial meltdown of 2008 affected millions of homeowners.”

“Economists warned that a sudden increase in interest rates could trigger a market meltdown, destabilizing the fragile recovery.”

Academic · Formal

Antonyms

Real-World Examples

“But Piastri had some kind of meltdown on the streets of Baku, what he described after arriving back in the city this week as "the worst race of my career".”
BBC News · 26 Sept 2026
“I can hear them squealing and laughing in the courtyard, on the edge of meltdown.”
The Guardian · 23 Aug 2026

Etymology

Deverbal from melt down.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domain

Psychology

This entry

Level
B2 · Upper Intermediate
Frequency
Frequent
Updated

Scan code

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English Reference