|We use in case to express that we are doing something in preparation for something which might happen.
|Take an umbrella in case it rains!
I’ll buy some more wine in case this bottle is not enough.
|In case of
|We use in case of to say what we should do if or when something happens.
|In case of fire, leave the building as quickly as possible.
(= ‘If there is a fire, leave the building.’)
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