DIGRESS
digress, stray, divagate, wander
(verb) lose clarity or turn aside especially from the main subject of attention or course of argument in writing, thinking, or speaking; “She always digresses when telling a story”; “her mind wanders”; “Don’t digress when you give a lecture”
sidetrack, depart, digress, straggle
(verb) wander from a direct or straight course
Source: WordNet® 3.1
Etymology
Verb
digress (third-person singular simple present digresses, present participle digressing, simple past and past participle digressed)
(intransitive) To step or turn aside; to deviate; to swerve; especially, to turn aside from the main subject of attention, or course of argument, in writing or speaking.
(intransitive) To turn aside from the right path; to transgress; to offend.
Usage notes
Often heard in the set phrase But I digress, where the word behaves as a stative verb, whereas it otherwise patterns as a dynamic verb.
Synonyms
• (turn from the course of argument): sidetrack
Source: Wiktionary
Di*gress", v. i. [imp. & p. p. Digressed; p. pr. & vb. n.
Digressing.] Etym: [L. digressus, p. p. of digredi to go apart, to
deviate; di- = dis- + gradi to step, walk. See Grade.]
1. To step or turn aside; to deviate; to swerve; especially, to turn
aside from the main subject of attention, or course of argument, in
writing or speaking.
Moreover she beginneth to digress in latitude. Holland.
In the pursuit of an argument there is hardly room to digress into a
particular definition as often as a man varies the signification of
any term. Locke.
2. To turn aside from the right path; to transgress; to offend. [R.]
Thy abundant goodness shall excuse This deadly blot on thy digressing
son. Shak.
Di*gress", n.
Definition: Digression. [Obs.] Fuller.
Source: Webster’s Unabridged Dictionary 1913 Edition