Translation guide
A copilot is a second pilot who assists the main pilot in operating an aircraft or other vehicle. In Japanese, this role is expressed with specific terms depending on the context, primarily in aviation.
The second pilot in an aircraft who assists the captain.
Standard term for a copilot in aviation. Used in formal and technical contexts.
彼は副操縦士としてその飛行機に乗っていた。
He was on the plane as a copilot.
Loanword from English, commonly used in casual or general contexts, but less formal than 副操縦士.
A person who assists or supports another in a secondary role, not necessarily in aviation.
There is no direct figurative equivalent for 'copilot' in Japanese. Instead, describe the role using words like 助手 (assistant) or サポート役 (support role).
彼は私の助手としてプロジェクトを手伝ってくれた。
He helped me with the project as my assistant.
Do not directly translate 'copilot' as コパイロット in non-aviation contexts. It may sound unnatural or overly literal. Use 助手 or a descriptive phrase instead.
彼は私のコパイロットです。
He is my copilot. (unnatural unless in aviation)
The copilot supports the captain.
She is the support person for the team.