1. 按摩使…吸收;搽
    If you rub a substance in, you press it into something by continuously moving it over its surface.

911查询·英语单词

    e.g. When hair is dry, rub in a little oil to make it smooth and glossy.
           等头发干了以后，搽上一点油，使其顺滑而有光泽。

2. 不断提及（某人不愿记住的事）
    If someone keeps reminding you of something you would rather forget you can say that they are rubbing it in .

    e.g. Officials couldn''t resist rubbing it in...
           官员们忍不住反复讲这件事。
    e.g. The home side rubbed in their superiority with a further goal.
           主队再进一球从而奠定了优势。