1. 1〔機械〕a gear(wheel); a cogwheel
    • 歯車の歯
    • a cog
    • 機械の歯車がかみ合っている[かみ合っていない]
    • The gears of the machine are [are not] properly engaged.
  1. 2〔組織の〕
    • この会社では僕は歯車のひとつにすぎない
    • As far as this company is concerned, I am just another cog in the machine.
    • 私たちは何となく歯車がかみ合わない
    • Somehow our personalities don't mesh.
    • 恋人が死んで以来彼女の人生の歯車が狂ってしまったようだ
    • Her life seems to have gone wrong [awry] since her boyfriend died.