What does "case" mean?

See case in WNW Idioms

get on someone's case

or get off someone's case☆
to start (or stop) intruding in another's affairs

in any case

no matter what else may be true; anyhow

in case

in the event that; if

in case of

in the event of; if there should happen to be

in no case

by no means; not under any circumstances; never

See case in American Heritage Dictionary 4 Idioms

in any case

Regardless of what has occurred or will occur.

in case

  1. If it happens that; if.
  2. As a precaution: took along an umbrella, just in case.

in case of

If there should happen to be: a number to call in case of emergency.

off (someone's) case

No longer nagging or urging someone to do something.

on (someone's) case

Persistently nagging or urging someone to do something.

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