hunker down to (something)
To work or begin to work on something in a determined matter. I can't believe I didn't get an A on my project after I'd hunkered down to it all weekend!
hunker down to something
Fig. to apply oneself to something, to get started working at something. I hunkered down to my chores, hoping to get them done before noon. If you want to get a good grade on that report, you'd better hunker down to it.