The phrase "do amiss" means to make a mistake or error. There are various synonyms for this phrase, including "err," "blunder," "foul up," "mess up," "screw up," "flub," "slip up," "botch," "muddle," and "fumble." These synonyms can be used interchangeably to convey the same meaning, and they are commonly used in everyday speech and written communication. Whether you're speaking with friends, family, colleagues, or writing a formal report, synonyms for "do amiss" can be helpful in avoiding repetition and adding variety to your vocabulary.