knock down a peg

Meanings:

• 1.

  USUKAustraliaGlobal Englishinformal
  • To humble or reduce someone's pride, arrogance, or perceived social standing.
  • To cause someone to feel less confident or less self-important.

• 2.

  Global Englishneutral
  • To cause a peg, peg-like object, or similar item to fall or be lowered from its position.