digress

verb

1. (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.

   “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.”

   “[…] For I hadn't had so much fun since the day / my brother's dog Rover / got run over. / (Rover was killed by a Pontiac. And it was done with such grace and artistry that the witnesses awarded the driver both ears and the tail – but I digress.)”

2. (intransitive)To turn aside from the right path; to transgress; to offend.

   “Thy overflow of good converts to bad; And thy abundant goodness shall excuse This deadly blot in thy digressing son.”