Verb
chomp at the bit (third-person singular simple present chomps at the bit, present participle chomping at the bit, simple past and past participle chomped at the bit)
(intransitive) To show impatience or frustration when delayed.
I have made a career of creating characters who fight school authority and chomp at the bit to get out into the 'real' world and live their lives, mostly because that's the kind of teenager I was. Chris Crutcher