too big for boots

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Related to too big for boots: tread on my toes

too big for your boots

  (British, American & Australian informal) also too big for your britches (American informal)
someone who is too big for their boots behaves as if they are more important or more clever than they really are Since he was made team captain, he's been ordering us all around and generally getting much too big for his boots.
See also: big, boot