群策群力[ qún cè qún lì ]

⒈ 群众的智谋和力量。例实赖同心同德之臣，亟合群策群力之助。——宋·陈元晋《见郑参政启》英brainstorm; by collective wisdom and efforts; pool the wisdom and efforts of the masses; pool all the brains and brawn for the job;