- sink one's teeth in
- get one's teeth into something & sink one's teeth intosomething & 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.
Dictionary of American idioms. 2013.