1. eagerly and impatiently wait to start doing something
I'm champing at the bit to begin my new job
The idiom 'chomp at the bit' or to 'champ at the bit' comes from horses biting on the 'bit' due to impatience. When you 'chomp at the bit' you are eager or impatient or be excited to start something. This is an idiom you are more likely to hear used in social contexts.