Correct

捂盖子

/ wǔ gàizi / 
Strokes

Definition

cover the lid

Example

As a Verb

keep the lid on—try to cover up the truth (about a crime, etc); conceal

1
Wǔ
捂
gàizi
盖子
zhǐnéng
只能
méngbì
蒙蔽
yī
一
shí
时
  
。

By covering up the truth, you can only fool people for the moment.