fill one's boots

verb2

1. •
   (informal) To eat heartily.

   • Famine might come back, so fill your boots. — 2012
2. •
   To perform at a high level in one's official role.

   • 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. — 2022

verb1

1. •
   To take over someone's role.

   • He leaves big boots for his successor to fill. — 2023