D defs.my
Entry 2 senses Webster, 1913

Sidetrack

/sīd'-trăkˌ/ · Side·track · IPA /ˈsaɪdˌtɹæk/
01 v. t. To transfer to a siding from a main line of track.
imp. & p. p. Sidetracked; p. pr. & vb. n. Sidetracking
  1. 1.
    To transfer to a siding from a main line of track.(Railroads)
  2. 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.]
    “Such a project was, in fact, sidetracked in favor of the census of school children.” — Pop. Sci. Monthly.