lobby是什么意思？

In some American cities, peer-to-peer taxi services have been banned after lobbying by traditional taxi firms.

Fantastic! I'll just wait in the lobby.

The changes would have to be approved or rejected as a whole by Congress, making it hard for narrow-interest lobbies to bend lawmakers to their will.

It did not escape notice that a lobbying firm set up by Lynton Crosby, David Cameron's election campaign director, had previously acted for Philip Morris International.

I’m a social worker, a lobbyist and a special assistant to the executive director at the National Association of Social Workers.