Webster's Revised Unabridged Dictionary · 1913

Digress

Digress , intransitive verb

[Latin digressus, past participle 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. [Rare]
Thy abundant goodness shall excuse This deadly blot on thy digressing son. — Shakespeare

Digress , noun

Digression. [Obsolete] — Fuller