The phrase "do favor" is commonly used to ask someone to help you out or do something for you. However, there are various synonyms for this phrase that you can use to add variety to your speech or writing. You can use phrases like "perform a kindness," "grant me a request," "extend a helping hand," "lend a hand," "be of assistance," or "do me a solid." All of these synonyms convey the same meaning as "do favor" but can help you avoid repetition. Whether you are speaking to friends, family members, or coworkers, using these synonyms can make your language more engaging and varied.