HSK 5 HSK V4
Correct

万一

/ wàn yī / 
Strokes

Definition

just in case/if by any chance/contingency

Example

As a Conjunction

just in case; if by any chance

1
Dài
带
shàng
上
yǔyī
雨衣
  
,
yǐfángwànyī
以防万一
xiàyǔ
下雨
  
。

Take the raincoat just in case it rains.

2
Wànyī
万一
yǒu
有
jǐnjí
紧急
qíngkuàng
情况
  
,
qǐng
请
àn
按
hóngsè
红色
ànniǔ
按钮
yǐ
以
qiēduàn
切断
diànyuán
电源
  
。

Should there be any emergency, please press the red button to cut off the electricity.

3
Wànyī
万一
dào
到
shíhòu
时候
wǒ
我
bù
不
zàijiā
在家
  
,
jiù
就
qǐng
请
zhàogu
照顾
wǒ
我
de
的
háizi
孩子
men
们
  
。

Just in case I'm not back, please take care of my children.

As an Adverb

what if

4
Wànyī
万一
zhè
这
chuánwén
传闻
shì
是
shìshí
事实
ne
呢
  
?

What if the rumour is true?

As a Noun

contingency; eventuality

5
Fángbèi
防备
wànyī
万一

be ready for all eventualities; be prepared for the worst

As a Noun

one ten-thousandth; very small percentage

6
Bǐmò
笔墨
bù
不
néng
能
xíngróng
形容
qí
其
wànyī
万一
  
。

It's simply beyond description.