(of a strategy, idea, or resource) kept secret and in reserve for use when needed
作为锦囊妙计的；留作一手的
he was new to the game but had a few tricks up his sleeve.
他虽不熟悉这项运动，却自有锦囊妙计。
he was new to the game but had a few tricks up his sleeve.
他虽不熟悉这项运动，却自有锦囊妙计。
Hidden but ready to be used
隐藏起来但准备使用的
I still have a few tricks up my sleeve.
我还有几种手段藏而待用呢