decompensate

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intransitive verb

de·​com·​pen·​sate (ˈ)dē-ˈkäm-pən-ˌsāt, -ˌpen- 

decompensated; decompensating

: to undergo decompensation

decompensatory

ˌdē-kəm-ˈpen(t)-sə-ˌtōr-ē, -ˌtȯr- 

adjective

decompensation

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noun

de·​com·​pen·​sa·​tion (ˌ)dē-ˌkäm-pən-ˈsā-shən, -pen- 

: loss of physiological compensation or psychological balance

especially : inability of the heart to maintain adequate circulation