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Difference between Be too big for one’s boots and Fill one’s boots

be too big for one’s boots—(also: be too big for one’s shoes) be too proud and conceited:

  • That showed … his arrogance in acting like a puffed up politician who is too big for his boots.

fill one’s boots—(UK coll.)

1. have or acquire as much of smth. as one wants:

  • Come on everybody, fill your boots, the food is on the table.

2. score lots of goals:

  • He would have filled his boots in European football; it’s a shame that such a player will end up with just one medal.