How to say "gear" in Japanese

• ギアCommon
  nounThe loanword for a gear as a mechanical part. Typical context: the gears of a car, bicycle, or machine, where ギア can mean a gear position or setting as well as the wheel itself.
  車くるまのギアを入いれずにリバースを入いれたので店先みせさきに多大ただいな損害そんがいを与あたえた。↗

  Instead of putting the car into gear, she put it into reverse, causing a great deal of damage to the store-front.
• 歯車はぐるまJLPT N2approx.Common
  nounThe native word for a gear as a physical cogwheel: a toothed wheel that meshes with others in a machine. Also used figuratively of a person who is just a cog in an organization.
  歯車はぐるまがかみ合あっている。↗

  The cog-wheels are in gear.

Both translate the mechanical sense of 'gear': 「ギア」 is the katakana loanword, at home in talk about vehicles and machinery, while 歯車 is the native word for the cogwheel itself and, figuratively, a cog in an organization.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ギアgear
• 歯車はぐるまgear
• 速そくgear
• 索具さくぐrigging
• リギングrigging
• 飛輪ひりんflywheel