get the bit between your teeth
US /ɡɛt ðə bɪt bɪˈtwin jʊər tiθ/
UK /ɡɛt ðə bɪt bɪˈtwin jʊər tiθ/

1.
pegar o jeito, ficar determinado
to become very enthusiastic and determined to do something
:
•
Once she got the bit between her teeth, there was no stopping her from finishing the project.
Assim que ela pegou o jeito, não havia como impedi-la de terminar o projeto.
•
He really got the bit between his teeth during the final stages of the competition.
Ele realmente pegou o jeito durante as fases finais da competição.