Antonyms for the phrase "take down a peg" include terms such as "praise," "elevate," and "commend." These words indicate the opposite of the phrase's original meaning, which suggests reducing someone's arrogance or confidence. In contrast, praising someone builds their confidence and elevates their ego. Similarly, commending someone for their achievements or accomplishments raises them up rather than tearing them down. To use antonyms in context, one might say something like, "I want to elevate her spirits today with words of encouragement," instead of saying, "I need to take her down a peg.