切り札
Common
Noun
1
noun (common) (futsuumeishi)
card games
trump;trump card
あの会社の社長は切り札を隠し持っています。
The president of that company has an ace up her sleeve.
2
noun (common) (futsuumeishi)
ace up one's sleeve;secret weapon
Other forms
切札 【きりふだ】