an umbrella
Examples
A bank is a place where they lend you an umbrella in fair weather and ask for it back when it begins to rain.
You say you love rain, but you use an umbrella to walk under it. You say you love sun, but you seek shelter when it is shining. You say you love wind, but when it comes you close your windows. So that's why I'm scared when you say you love me.
My dreams are a stupid refuge, like an umbrella against a thunderbolt.
There is no use in carrying an umbrella if your shoes are leaking.
It's no use carrying an umbrella if your shoes are leaking.
Any fool carries an umbrella on a wet day, but the wise man carries it every day.