the.com/sick day

A day you spend recovering from the job that's making you sick.

means A day off from work taken because you're too ill to do your job, usually with pay if you're lucky enough to have it.

from Straightforward compound: 'sick' (from Old English 'seoc,' meaning ill or unwell) plus 'day,' simply naming what the day is for. The term itself is a modern workplace coinage, tied to the rise of formal employee benefits in the 20th century — once sick leave became a codified entitlement rather than an informal mercy from an employer, it needed a name, and this is the plain one that stuck.

actual use
Half are taken while not sick
etymology
Coined when illness still meant contagious, not burnt out
guilt tax
Most workers feel compelled to justify taking them
global gap
Many countries guarantee them; the US largely doesn't
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