put是放，on是在……的上面，dog是狗，put on the dog的字面意思是放在狗身上。而真实意思是摆架子，耍派头，装腔作势，摆阔。

【例句】
If I have much money, I will put on the dog.
如果我有很多钱，我会摆阔。

But what I like about him was that he never put on the dog to show off his money.
我很喜欢这个朋友，因为他从来也不炫耀自己多么有钱。