figurative. To drive on or hasten; to incite, impel, or stimulate; to urge or prompt. Frequently const. to (do something, or some course of…

spec. absol. To spur, ‘prick’. Obsolete.

intransitive. Chiefly with infinitive as complement. To prompt, encourage, or incline one; to permit one. Obsolete.

transitive. To stimulate to activity (organs or faculties); to provoke (appetites or desires); to spur on, incite (persons). Const. to.

To act as an impelling or prompting motive, stimulus, or force; to incite or stimulate; to exercise pressure or constraint.

intransitive.

To urge or goad. Frequently with adverbs, esp. on.

transitive. To urge irresistibly, to constrain, oblige, force. absol.