have sth up〔in〕 one's sleeve
有锦囊妙计keep sth secret for use at the right time in the future
I've got a few ideas up my sleeve if this method doesn't work.如果这个方法没有用,我自有妙计。
Things look bad for them,but they still have a few cards up their sleeve.情况看上去对他们不利，但他们手上还掌握着几张王牌没有亮出来。
laugh up〔in〕 one's sleeve
暗暗发笑,偷笑laugh secretly and often unkindly
Anna was laughing up her sleeve when Joe fell into the trap she set.当乔上了她设的圈套后,安娜暗自高兴。
