"Chafing at the bit" is a common expression used to describe impatience or frustration in someone who is eager to take action. However, there are a variety of synonyms that can be used to express the same sentiment. "Eager beaver" refers to someone who is enthusiastic and excited to get started on a project. "Restless" suggests a feeling of agitation or unease when waiting for something to happen. "Antsy" is a colloquial term that implies a feeling of jitteriness or restlessness. "Impatient" is a more straightforward synonym for "chafing at the bit", indicating a lack of tolerance for delays or setbacks. Any of these phrases can be used to convey the same meaning as "chafing at the bit" in various contexts.