1
general::
Phrase(s): log someone off [and] log someone out
[for someone] to cause someone to exit from a computer system. (This exit may be recorded, or logged, automatically in the computer’s memory.) • Mary had to rush off to an appointment, so I logged her off., Phrase(s): log off [and] log out
to record one’s exit from a computer system. (This action may be recorded, or logged, automatically in the computer’s memory.) • I closed my files and logged off. • What time did you log out?
McGrawhill's American Idioms And Phrasal Verbs