digress
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verb no object
leave the main subject temporarily in speech or writing:
｟かたく｠ 〈話し手･書き手が〉 【主題･本筋から】(横道へ)脱線する, それる «from» .
e.g. I have digressed a little from my original plan.
DERIVATIVES
digresser noun
ORIGIN
early 16th century: from Latin digress- ‘stepped away’, from the verb digredi, from di- ‘aside’ + gradi ‘to walk’.