In case of

In case of

Word form
Preposition

Meaning
If something happens.

Examples
1. In case of bad weather, the ceremony will be held indoors.
2. In case of emergency, please call 112.

References  
http://dictionary.cambridge.org/dictionary/english/case?q=in+case+of+something
http://idioms.thefreedictionary.com/in+case+of
http://www.macmillandictionary.com/dictionary/british/in-case?q=in+case+of#in-case__4

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