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Phrase(s): get one’s teeth into something [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.
McGrawhill's American Idioms And Phrasal Verbs