Take an umbrella just in case it rains.
just in case
idiomyou say this when you do something to be safe or ready for a possible problem in the future.
I packed an extra pair of socks in my bag just in case my feet got wet during the hike.
She kept a small amount of cash hidden in her wallet, just in case her credit cards failed while she was traveling abroad.
Last updated April 22, 2026