The phrase "chafes the bit" often refers to a feeling of impatience or restlessness, but there are many other ways to express this sentiment. One synonym is "eager to go", which captures a sense of anticipation and readiness. Another possibility is "chomping at the bit", which adds a bit of humor and exaggeration to the phrase. A more formal alternative might be "anxious to begin", which conveys a sense of urgency and importance. Overall, there are many ways to describe the feeling of being held back or restrained, and choosing the right words can help to capture the full range of emotions and sensations.