fill one's boots

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fill one's boots (third-person singular simple present fills one's boots, present participle filling one's boots, simple past and past participle filled one's boots)

1. (informal) To eat heartily.
   • 2012, Aubrey Malone, The Mammoth Book of Irish Humour:

     Famine might come back, so fill your boots.

2. (idiomatic) To perform at a high level in one's official role.
   • 2022 November 29, Ian Mitchelmore, “Wales put out of World Cup misery by England as sobering tournament must signal changing of the guard”, in WalesOnline‎:

     Rashford added insult to injury as he drilled through the legs of Ward, with England firmly in the mood to fill their boots against a ragged Wales.