Dig in

I wanted to say grace before dinner, but the kids were already digging in.

I've got to dig in for a couple of weeks to secure my promotion.

Mancini's men were far from their best but dug in to earn a 10th win in 11 league games and an eighth successive victory in all competitions to maintain their five-point lead at the top of the table.

If Russia choses to dig in, then the military balance – which typically favours the defender on a 3-1 ratio – is reversed.

to dig in one's feet, heels, etc.