intransitive. With to or unto. To succeed in understanding something. Obsolete.

figurative. To understand something not clearly expressed; to perceive or apprehend a hidden design or signal. Const. to, that. slang. Also transitive…

intransitive. Originally U.S. colloquial. To gain an understanding of something; to understand, comprehend. Cf. sense 29b.

Of a person: To become lively, animated, or stirring; usually with up. Also, to become ‘alive’ to (a situation, etc.). Cf. wake, v. 7c.

to wise up (U.S. slang): to ‘get wise’; to ‘put wise’. Frequently const. on or to. Also reflexive.

figurative. To become mentally receptive to, or aware of; to comprehend. Const. as preceding sense.

Colloquial phrase to cotton on to: (a) to become attached to; to form a liking for; (b) to understand; to get to know about; also to cotton on, to…

intransitive. With in. To complete a circuit or make an electrical connection by inserting a plug or key. Also figurative with into: to establish a…

transitive. To take hold of, grasp, seize (esp. with the hand or claws); to clasp, embrace (with the arms); to grasp with the mind, to…