To start doing or become involved in something with one's utmost energy, determination, or enthusiasm. I'm always looking for a great book to get my teeth into.I'd like you to get your teeth into this new project I'm developing.
get one’s teeth into something
and sink one’s teeth into something
tv. to undertake to do something. She’ll do better as soon as she gets her teeth into the task. I can’t wait to sink my teeth into that Wallace job.