The phrase "doth ones bit" can be interpreted as performing one's duty, responsibility or obligation. When looking for antonyms for this phrase, it can be challenging as it is a positive action. However, some possible opposite or contradictory words to "doth ones bit" could be "neglect," "ignore," "abandon," "shirk," "avoid," or "evade." These antonyms convey a lack of responsibility, failure to meet one's obligation or duty, and avoidance of tasks. While it is essential to do one's bit, it is equally crucial to recognize and address any underlying issues that may be hindering one's ability to fulfill their duties effectively.