Antonyms of "biding one's time" are "rushing", "hurrying", and "taking impulsive actions". These antonyms suggest impatience and a lack of deliberate planning. People who rush into action without analyzing the situation properly are more likely to make hasty decisions that lead to negative outcomes. Impatient individuals often feel like they can't wait to achieve their goals and may take shortcuts or make sacrifices to get there. However, by doing so, they may miss out on valuable opportunities or damage their reputation. So, instead of rushing, hurrying or taking impulsive actions, it's better to take a measured approach and wait for the right moment to take action.