1. failing to maintain adequate physical or mental function; breaking down in health or stability
Usage: medical/psychological context; present participle of decompensat
2. losing the ability to cope with stress or emotional demands
Usage: psychological/mental health context

Examples

• The patient's heart condition began decompensating after the surgery.
• Without proper medication, his mental health started decompensating.
• She was decompensating under the stress of her new job.
• The elderly man's kidneys were decompensating, requiring immediate intervention.
• After months of untreated anxiety, he found himself decompensating emotionally.
• The system was decompensating as more pressure was applied to it.