di·gress /daɪˈgrɛs, də-/
  (vi.)走向岔道,離題,扯到枝節上
  Di·gress v. i. [imp. & p. p. Digressed p. pr. & vb. n. Digressing.]
  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. Digression. [Obs.]
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  digress
       v 1: 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" [syn: stray, divagate, wander]
       2: wander from a direct or straight course [syn: sidetrack, depart,
           straggle]