The phrase "knocks off high horse" can be defined as humbling or bringing down someone who is arrogant or overly proud. Antonyms for this phrase would be words or phrases that convey the opposite meaning, such as "lift up," "boost," "elevate," "encourage," "praise," "compliment," or "applaud." These words would be used to describe actions that build up someone's confidence and self-esteem, rather than tearing them down. Using antonyms for "knocks off high horse" can promote a more positive environment and lead to healthier relationships, by focusing on uplifting and inspiring others instead of bringing them down.