intensive care
noun /ɪnˌtensɪv ˈkeə(r)/
  /ɪnˌtensɪv ˈker/
(also critical care)
 [uncountable]- continuous care and attention, often using special equipment, for people in hospital who are very seriously ill or injured- She needed intensive care for several days.
- intensive care patients/beds
 
- (also intensive care unit, ICU [countable])the part of a hospital that provides intensive care- in intensive care The baby was in intensive care for 48 hours.
- She’s still critically ill in intensive care.