dug in

Verb

dig in (third-person singular simple present digs in, present participle digging in, simple past and past participle dug in)

1. (colloquial) To begin eating.
   • I wanted to say grace before dinner, but the kids were already digging in.

   Synonyms:

   chow down, fall to, tuck in

2. (colloquial) To engage in a burst of hard work.
   • I've got to dig in for a couple of weeks to secure my promotion.

   Synonyms:

   fall to, go for it

3. (also, figuratively) To dig trenches to resist an enemy attack.
   • If Russia choses to dig in, then the military balance – which typically favours the defender on a 3-1 ratio – is reversed.2022 April 4, Dan Sabbagh, “Routing of Russian forces from Kyiv area will be hard to repeat in eastern Ukraine”, in The Guardian
4. (idiomatic) To adopt a resolute state of mind.
   • to dig in one's feet, heels, etc.
5. To cover over by digging.