noun, noun or participle which takes 'suru'
unison; accord; acting together
Refers to people acting in harmony or with one heart; somewhat formal and not an everyday word. Often used in contexts like teamwork, cooperation, or shared purpose.
チームが協心してプロジェクトを成功させた。
The team worked in unison and made the project a success.
協心
If we act together, we can overcome any difficulty.