get teeth into
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get (one's) teeth into (something)
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 somethingand sink one's teeth into something; get one's teeth in; sink one's teeth in
Fig. to begin to do something; to get completely involved in something. I can't wait to get my teeth into that Wallace job. Here, sink your teeth into this and see if you can't manage this project. He'll find it easier when he sinks in his teeth.