"Taken down a peg" is an idiom that means to be humbled or to have one's ego deflated. There are several synonyms for this expression, such as "put in one's place," "knocked off a pedestal," "brought down a notch," and "humbled." Other synonyms include "chastened," "humbled," "abashed," "subdued," "mortified," and "rebuked." All these expressions are commonly used to describe a situation where someone is made aware of their faults, mistakes or weaknesses, causing them to feel embarrassed, ashamed, or uncomfortable. Whatever the term may be, each one of them describes a situation where someone receives a reality check or a dose of humility.