To try to get the best of both worlds; to seek to gain advantages from two different sources, often implying opportunism or greed.
他总是西食东眠，希望能在两个项目组都分到奖金，结果两边的工作都做得不尽人意。
He always tried to have the best of both worlds, hoping to get bonuses from both project teams, but ended up doing unsatisfying work on both sides.
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