co-worker
🇺🇸
/ˈkəʊ wɜːrkər/
🇬🇧
/ˈkəʊ wɜːkə(r)/
A person who works with you in the same place.
My co-worker helped me with the project when I was feeling overwhelmed.
私にプロジェクトで困難を感じていた時に、同僚が助けてくれました。