and 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.
to start to do something with a lot of energy and enthusiasm Up till then she'd only had small parts in films and nothing she could get her teeth into.It's a really exciting project - I can't wait to sink my teeth into it.