fill
fill the bill: seebill.
fill your boots take full advantage of an opportunity to benefit yourself. British informal
2011New Statesman The banking crisis, MPs' expenses. Journalists hacking phones. From them all a something for nothing culture. Take what you can. Fill your boots. Who cares as long as you can get away with it.
fill someone's shoes (or boots) take over someone's function or duties and fulfil them satisfactorily. informal
have had your fill of have had as much or many of something as you want or can bear.