wallet
钱包，皮夹 

例句：
He always keeps a lot of money in his wallet.
他总是在钱包里放很多钱。
 

give oneself away
露马脚，露破绽
 
例句：
Laura played a joke on her father and gave herself away by laughing.
劳拉想和父亲开个玩笑，可是她一笑就露了马脚。

Can you give me a discount?
你能给我打折吗？

对话：
A: I'd like to buy this toy dog. Can you give me a discount?
B: Sorry, ma'ma. We don't bargain.
A: Then, can you wrap if up? I'll take it.　　　　　　　　
　　　
A：我想买这只玩具狗。你能给我打折吗？
B：对不起，夫人，我们不还价。
A：那么，你能把它包起来吗？我要买它。