also: ちーむめーと
teammate
Standard loanword for a fellow member of a sports team, work group, or collaborative project.
彼は私のチームメイトです。
He is my teammate.
I worked with my teammates to complete the project.
I'm happy to have become teammates with him.
You should help your teammates when they're in trouble.
We cooperated with our teammates to win the match.
After I failed, my teammate encouraged me.