1. 向（政府官员、委员会委员等）进行游说（或疏通）
    If you lobby someone such as a member of a government or council, you try to persuade them that a particular law should be changed or that a particular thing should be done.

lobby

    e.g. Carers from all over the UK lobbied Parliament last week to demand a better financial deal...
           英国各地的家庭看护人员上周向议会游说，要求改善经济待遇。
    e.g. Gun control advocates are lobbying hard for new laws...
           枪械管制支持者正努力游说通过新法。

2. 游说团体；活动集团
    A lobby is a group of people who represent a particular organization or campaign, and try to persuade a government or council to help or support them.

lobby的翻译

    e.g. Agricultural interests are some of the most powerful lobbies in Washington...
           农业利益集团是华盛顿最具影响力的游说团体之一。
    e.g. He set up this lobby of independent producers.
           他组织了这个由独立生产商组成的游说团。

3. （旅馆等大型建筑的）门厅，大厅，大堂
    In a hotel or other large building, the lobby is the area near the entrance that usually has corridors and staircases leading off it.

    e.g. I met her in the lobby of the museum.
           我在博物馆的前厅遇见了她。