passive. To be profoundly absorbed or engrossed in a habit or practice.

intransitive. To examine a book, map, etc., with fixed attention; to study or read earnestly or with intense concentration; to be absorbed in reading…

transitive. To immerse or plunge (a person, a person's heart or soul, etc.) deeply in a specified state. In later use in passive: to be absorbed in…

passive. To be possessed with.

In passive: ? To have one's attention fixed upon.

intransitive. With at, on. To concentrate or dwell upon, be preoccupied with. Obsolete.

reflexive. To devote oneself; passive. To be devoted. Const. to. Obsolete.

to busy one's brains: to spend time trying to think about something, esp. something considered trivial.

reflexive (with corresponding passive). To become deeply absorbed or engrossed (in thought, etc.); to be bewildered, overwhelmed (in wonder); †to…

intransitive for reflexive. To plunge oneself, sink, become absorbed. literal and figurative. Now rare or Obsolete.

To enter into, give adhesion to, fall in with (an idea, project, etc.); to engage deeply in (a business); to fall into (an error, a snare). Now…

to make a study of: to undertake an examination or investigation of; to devote oneself to the study of.