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3. off on a sidetrack

off on a sidetrack

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*off on a sidetrack

Fig. on a digression; discussing a topic that is not the main topic. (Alludes to a train waiting on a siding. *Typically: be ~; get ~; get someone~.) Anne got off on a sidetrack and never returned to her topic. The ineffective committee got off on one sidetrack after another.

See also: off, on