so as not to; so as to avoid

miǎn de

m+iǎn·3rd toned+e·neutral tone

Examples2 available

Maybe we should take a step back before we fall?

我们是不是該退一步，免得倒下？

You must do all you can lest you should regret later.

你必須盡一切可能盡力而为, 免得你以后后悔。