sick leave 
noun [mass noun]
Leave of absence granted because of illness: he took a week’s sick leave she was on sick leave for two months...
- When PC Furness went on sick leave her absence on the streets prompted juvenile nuisance to increase on her beat.
- Grocon wants greater control over rostered days off, sick leave, annual leave and working hours.
- Most apparent in this regard is the absence of adequate sick leave, maternity provision, and child health care.