What does “get your teeth into” mean?

to put a lot of effort and enthusiasm into sth that is difficult enough to keep you interested

How is “get your teeth into” used?

In Double Indemnity (1944), one line is: “Once he gets his teeth into something, he never lets go.”

The clip at the top of this page is from Double Indemnity (1944).

Once he gets his teeth into something, he never lets go.

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