To allow for the possibility that.
I'll take an umbrella, in case it rains.
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(mostly, North American) If.
I’ve bought a chicken in case grandpa should stay to dine.
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Add your own interpretation of "in case".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.