Verb

(es)

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.

* Holland

Moreover she beginneth to digress in latitude.

* John Locke

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.

* {{quote-song

, year = 1959 , title = In Old Mexico , composer = (Tom Lehrer) , passage = 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 .) }}

To turn aside from the right path; to transgress; to offend.

* Shakespeare

Thy abundant goodness shall excuse / This deadly blot on thy digressing son.

Verb

(en verb)

To remove or reduce; especially to reduce a quantity or number

If you subtract the $100 for gas and bridge toll, it was a fairly inexpensive trip.