Correct

冒顶

/ màodǐng / 
Strokes

Definition

(mining) roof fall/to have the roof cave in

Example

As a Verb

cave (in); (roof) fall in

1
Gōngzuòmiàn
工作面
màodǐng
冒顶

face fall

2
Dà
大
màodǐng
冒顶

bulk caving