[qián wǎn hòu tuī]   

前    挽    后    推    形容前后都有人帮助。

前挽后推是一个成语，出自《左传·襄公十四年》，形容前后都有人帮助。

With some drawing in the front and others pushing in the rear, one could not but advance

前目后凡    前所未闻    前危后则    前挽后推    前倨后恭