Correct

亮底牌

/ liàng dǐpái /
Strokes

Definition

to show one's hand/to lay one's cards on the table

Example

As a Verb

cast/play one's trump card

1
Liàng
de
pái
底牌
  
,
kànkan
看看
shuí
de
pái
  

Show your final card and let's see who will win.

As a Verb

reveal/disclose one's real purpose, intention, plan, etc; put one's cards on the table; have a showdown

2
de
pái
底牌
liàngliàng
亮亮
  
,
men
我们
hǎo
也好
yǒu
zhǔnbèi
准备
  

Put your cards on the table so that we can make necessary preparations.