- get one's teeth into smth.
- или sink one's teeth into smth.гopячo, вcepьёз взятьcя зa чтo-л., вгpызтьcя вo чтo-л.The old chap should find that Charles V. was not to be defied that when he got his teeth into a thing he did not let it go (J. Galsworthy). For the first time in years they'll have a real live issue to get their teeth into, and Deitz and company will make the most of it (A. Hailey). Frank chose a subject for his report that he could sink his teeth into
Concise English-Russian phrasebook.