"Chomped the bit" is an idiomatic expression used to describe a person's eagerness or impatience to do something. There are several synonyms for this phrase including "champed at the bit," "gnashed the bit," and "clenched the bit." All of these expressions share a common meaning and convey the idea of someone waiting anxiously to take action. Other phrases that could be used as synonyms for "chomped the bit" include "itching to go," "bursting at the seams," and "unable to contain oneself." All of these phrases can be used to describe someone's strong desire or impatience to get started on a task or project.