两面讨好[ liǎng miàn tǎo hǎo ]

⒈  在两派之间摇摆或保持中间立场以讨好双方的人。

例两面讨好，以求万全。

英trim; be on both sides of the fence; fuctuate between two parties so as to appear to favour each; run with the hare and hunt with the hounds; try to keep favour of both sides;