intransitive. With to. To begin in earnest to do something; to apply oneself to. Obsolete.

intransitive. To work closely and energetically (at a task); to buckle to one's work. Also with adverb, as to, away. slang.

intransitive. To settle down to (an activity, a topic, etc.); to turn one's attention to. Frequently in to get down to it: to get started; to begin…

colloquial. To ‘come to grips with’, to enter into a discussion or argument with; to attack; to approach or question on some subject.

to buckle ˈto: to set to work, apply oneself vigorously. Also to buckle down (to) (originally U.S.).

to bite on (fig.): to ‘get one's teeth into’, to take or get hold of (something substantial).

to wade in: to make a vigorous or concerted attack on one's opponent; to intervene, esp. vocally; to wade into (colloquial, originally U.S.): to…

transitive (in passive). colloquial (originally Australian and New Zealand). to get stuck into: to attack with blows, to lay into; (subsequently)…

to get one's teeth into: to become engrossed in; to come to grips with, to begin serious work on.

to sink one's teeth into: (a) to bite deeply into (something); (b) figurative to tackle (something) with enthusiasm, to work energetically and…

transitive (in passive). colloquial (originally New Zealand). to get stuck in: to begin something with enthusiasm or determination; to set to work…

figurative. Firm or tenacious hold, grasp, or control; power, mastery (now esp. associated with the idea of oppression or irresistible force)…