1. 向…谄媚;奉承;讨好
    If someone flatters you, they praise you in an exaggerated way that is not sincere, because they want to please you or to persuade you to do something.

flatter的解释

    e.g. I knew she was just flattering me.
           我知道她只是在恭维我。
    e.g. ...a story of how the president flattered and feted him into taking his side.
           有关总统如何恭维并盛宴款待他、让他站到自己一边的故事

2. 自认为;自以为是
    If you flatter yourself that something good is the case, you believe that it is true, although others may disagree. If someone says to you 'you're flattering yourself' or 'don't flatter yourself', they mean that they disagree with your good opinion of yourself.

flatter

    e.g. I flatter myself that this campaign will put an end to the war...
           我自认为这次战役将结束这场战争。
    e.g. I flatter myself I've done it all rather well...
           我认为自己已经做得相当好了。

3. 使显得更漂亮
    If something flatters you, it makes you appear more attractive.

    e.g. Orange and khaki flatter those with golden skin tones...
           橘黄色和卡其色能衬托那些金黄色皮肤的人。
    e.g. My philosophy of fashion is that I like to make clothes that flatter.
           我的时尚理念就是我喜欢做让人穿着更显漂亮的衣服。