The Collaborative International Dictionary of English v.0.48:
Digress \Di*gress"\, v. i. [imp. & p. p. Digressed; p. pr. &
vb. n. Digressing.] [L. digressus, p. p. of digredi to go
apart, to deviate; di- = dis- + gradi to step, walk. See
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.
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
Thy abundant goodness shall excuse
This deadly blot on thy digressing son. --Shak.