lit. when a man achieves the Dao, his poultry and dogs rise to Heaven (idiom) / fig. to ride on sb else's success / Once one man gets a government position, all his cronies get in too / Once sb has cracked the problem, every Tom, Dick and Harry can do it
to use an opponent's own methods to obtain retribution (idiom, from Song dynasty neo-Confucianist Zhu Xi 朱熹); to get revenge by playing sb back at his own game / to give sb a taste of his own medicine