sign (someone) off
Definition: (only done by doctors) to write a note to your employer, saying that you are unable to work for a particular period of time because you are sick.
(This phrasal verb has more than one meaning)
E.g.1: The doctor signed me off for two weeks.
E.g.2: I’m afraid I can’t sign you off work Mr. Smith. A hangover is not a recognised illness.
This phrasal verb can be separated. (E.g. 1 and 2).