Correct

一病不起

/ yī bìng bù qǐ / 
Strokes

Definition

to fall gravely ill, never to recover (idiom)

Example

As a Verb

take to one's bed and never leave it again; fall ill and die

1
Tā
他
zěnme
怎么
hūrán
忽然
yībìngbùqǐ
一病不起
  
?

How was it that he died so suddenly after such a brief illness?