Third-person singular simple present indicative form of dig in

(transitive) To remove something by digging. / (transitive, sometimes figuratively) To find or retrieve something buried. / (transitive) To make something by digging.

(colloquial) beneath one's dignity

(transitive) to excavate something / (transitive, idiomatic) to discover something by digging; to unearth

(idiomatic) To make a lot of effort with all one's resources.

(video games, roguelikes) To descend through the dungeon as quickly as possible, without spending unnecessary time on the upper levels.

A box filled with dirt or sand for a captive animal to dig in as enrichment.

(horticulture) To remove a spade's-depth of topsoil, then loosen the exposed subsoil with a fork, before replacing the topsoil; done to improve heavy or compacted ground for planting.

(idiomatic, transitive) To save someone or something from trouble.

(idiomatic) To act in a determined manner by firmly maintaining one's beliefs, demands, situation, etc. in the face of opposition.