From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. Hence, fig., to divert or reduce to a position or condition that is relatively secondary or subordinate in activity, importance, effectiveness, or the like; to switch off; to turn aside, as from a purpose. [Colloq.]
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
89 Moby Thesaurus words for "sidetrack": L, avert, bear off, branch, bypath, byway, cable railway, cog railway, deflect, departure, deviation, digression, discursion, distract, divert, draw aside, draw off, ease off, edge off, el, electric railway, elevated, elevated railway, embankment, episode, excursion, excursus, feeder, feeder line, fly off, gee, glance, glance off, go off, gravity-operated railway, haw, head off, horse railway, jib, junction, light railroad, line, main line, make way for, metro, monorail, move aside, rack railway, rack-and-pinion railway, rail, rail line, railroad, railway, roadbed, roadway, sheer off, shove aside, shunt, shy, shy off, side, side path, side road, sidestep, siding, sidle, steer clear of, step aside, street railway, streetcar line, subway, switch, switchback, terminal, terminus, track, tram, tramline, trestle, trolley line, trunk, trunk line, tube, turn aside, turn away, turn back, turnout, underground, veer off
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