Meaning of yǐ fáng wàn yī:

yǐ fáng wàn yī

以防万一

Conjunction

to guard against the unexpected (idiom); just in case; prepared for any eventualities

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Wǒ zǒng shì dài sǎn chūmén, yǐ fáng wàn yī xiàyǔ.

我总是带伞出门，以防万一下雨。

I always take an umbrella when I go out, just in case it rains.

Wǒ dài le yī bǎ sǎn, yǐ fáng wàn yī jīntiān xiàyǔ.

我带了一把伞，以防万一今天下雨。

I brought an umbrella just in case it rains today.