meltdown
n. countable B2 Upper Intermediate US //ˈmɛɫtˌdaʊn// UK //mˈɛltdaʊn// melt·down
n. a sudden loss of control or calm, often because of stress or anger. You use this when someone gets very upset and acts in a way that seems out of control.
n. a sudden and dramatic loss of emotional control or stability. Often used metaphorically to describe a system failure or crisis.
The toddler had a meltdown in the supermarket.
After hours of arguing, she had a meltdown and left the room.
The political scandal triggered a public meltdown that forced the minister to resign immediately.
Deverbal from melt down.