This is the 4922nd most frequent Japanese word.
相棒
"Partner" or "trusted companion."
In this sentence, '相棒' refers to a collaborator or teammate who shares equal responsibility and involvement in the project.
相棒と一緒にプロジェクトを完成させた。
I completed the project together with my partner.
Here, '相棒' is used to describe a colleague or co-worker with whom one has a close working relationship beyond the work environment.
彼は仕事の相棒であり、長年の友人でもある。
He is my work partner and also a longtime friend.
In this example, '相棒' depicts a companion in a professional or frequent partnership where both individuals contribute to achieving a common goal.