Digress
来自Big Physics
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early 16th century: from Latin digress- ‘stepped away’, from the verb digredi, from di- ‘aside’ + gradi ‘to walk’.
wiktionary
From Latin digressum, past participle of digredi.
etymonline
digress (v.)
"to turn away in speaking or writing from the direct or appointed course," 1520s, from Latin digressus, past participle of digredi "to go aside, depart, deviate," from dis- "apart, aside" (see dis-) + gradi "to step, go" (from PIE root *ghredh- "to walk, go"). Or perhaps it is a back-formation from digression. Related: Digressed; digressing.