up one's sleeve

(of a strategy, idea, or resource) kept secret and in reserve for use when needed

作為錦囊妙計(jì)的；留作一手的

he was new to the game but had a few tricks up his sleeve.

他雖不熟悉這項(xiàng)運(yùn)動，卻自有錦囊妙計(jì)。

wear one's heart on one's sleeve

he was new to the game but had a few tricks up his sleeve.

他雖不熟悉這項(xiàng)運(yùn)動，卻自有錦囊妙計(jì)。

up (one's) sleeve

Hidden but ready to be used

隱藏起來但準(zhǔn)備使用的

I still have a few tricks up my sleeve.

我還有幾種手段藏而待用呢