in case of sth meaning

[American slang]
if a problem occurs; if something happens; in the event that something happens.
  What do we do in case of fire?
  In case of an accident, call the police.

• a case of sth:    [American slang]1. ...
• case so or sth out:    [American slang]Sl ...
• in the case of so or sth:    [American slang]in ...