latch onto the rich and powerful 抱大腿

“抱大腿”，指借助他人的优势来获得收益的行为，特别指弱者主动去借助强者的优势，与英文习语“ride one's coattails”意思相近，表示“to use someone else's success as a means to achieve one's own”。

“大腿”往往指有权有势的对象，因此“抱大腿”也可翻译为“latch onto the rich and powerful”。

例句：

众所周知，过去两年你一直在抱州长的大腿，但她的任期一结束，你就只能靠自己了。

Everyone knows you've been riding the governor's coattails for the last two years, but once her term ends you'll be on your own.