noun, noun or participle which takes 'suru'
concerted effort; solidarity; joining forces
Used when people or groups work together in agreement toward a common goal. Often appears in formal or organizational contexts.
問題解決には全員の一致協力が必要だ。
Solving the problem requires the concerted effort of everyone.
両社は一致協力して新製品を開発した。
The two companies joined forces to develop a new product.