The phrase "did one bit" suggests that someone has done something, but it doesn't specify the nature of the action. There are numerous antonyms to this phrase, depending on the context in which it is used. For example, if the phrase is referring to productivity, the antonyms could be "procrastinated," "slackened," or "unaccomplished." If the phrase is referring to motivation, then the antonyms could be "apathetic," "indifferent," or "uninterested." Overall, the antonyms to "did one bit" vary depending on the type of activity or performance it refers to, and they offer an array of contrasting meanings that may create different perspectives on the topic at hand.