the.com/sick leave

means Paid time off you're allowed to take when illness keeps you from working.

from A plain compound of 'sick' (Old English 'seoc,' meaning ill) and 'leave' (Old English 'leaf,' meaning permission) — the same 'leave' as in 'leave of absence,' not the kind that falls off trees. The phrase itself is a product of organized labor and workplace policy, becoming standard terminology as 19th- and 20th-century employers and unions formalized benefits; before that, being too ill to work just meant going unpaid.