Take down a peg
Meaning
Reduce someone's ego or pride.
Usage
Used when humbling someone overconfident.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Medieval practice of lowering a peg to shrink height or rank, metaphorically deflating pride.
Used in print by the mid nineteenth century.