Const. with infinitive (a development from 1b): To set about, set oneself, try, begin or prepare (to do something); to proceed or go on (to do).

transitive. With infinitive clause as object, or (in later use) with it as anticipatory object and infinitive clause as complement: to undertake (to…

intransitive or with infinitive. To set oneself (to do something), to address or apply oneself. Obsolete.

intransitive. To aim, endeavour, or undertake deliberately to do something. Now rare.

to put (also lay, set,etc.) one's hand to the plough and variants (after Luke 9:62): to undertake a task; to enter upon a particular course of life…

To apply oneself to do something; to endeavour, to strive. Obsolete.

intransitive. To endeavour or attempt to do something, esp. with eagerness or haste; to aim at or strive after. Also transitive with indirect…

to put oneself in press: to exert oneself, put oneself forward; to strive or undertake to do something (cf. press, v.1 10). Obsolete.

Perhaps: to apply oneself to something. Obsolete.

To enter upon, commit oneself to, an enterprise. Obsolete.

transitive. To try, endeavour (to do something). Also intransitive. Cf. assay, v. 17.

to fall in hand with (also todo (something)): to set about (a task), to proceed to do (something). Obsolete.

intransitive in the same sense: const. to with noun (pronoun) or infinitive, or to or a- with gerund. (Cf. to set about at phrasal verbs 2.)

intransitive. Scottish. To commit oneself, promise, give an undertaking. Obsolete.

with infinitive. To set oneself, undertake, try (to do something). Also absol.; = assay, v. 17.

To turn the energies to, give practical heed to, apply oneself to, look after. with infinitive. To apply oneself, endeavour. Obsolete.

intransitive. Probably: to undertake. Obsolete. rare.

to set in foot: to enter upon an undertaking.

intransitive. To make an attempt; to engage in an undertaking, embark upon an endeavour; to work towards a goal. Also with on, upon. Now rare.

intransitive. To direct one's efforts towards a particular goal; to endeavour to do something. Obsolete.

To place (a person or thing) in one's possession or control, or in a condition to be used, dealt with, or occupied.

intransitive. To set oneself to do something; to try, strive, essay. Obsolete. rare.

to make it one's business: to undertake as a self-appointed task (to do something).

intransitive for reflexive. ‘To embark in any business’ (Johnson); to enter upon or employ oneself in an action. Const. in, formerly on, upon, and s…

To engage in a business or undertaking, as in war, commerce, or the like.

intransitive (for reflexive)

To apply oneself to action; to set to; to take an active part. dialect and U.S.