两面三刀 [liǎng miàn sān dāo]

• play a double game; be a double-dealer; be double-faced; be two-faced; carry fire in one hand and water in the other; double cross; double-dealing; double-faced tactics; have two faces; say one thing and do another; use dual tactics:

  Double-dealers will come to no good end.

  两面三刀的人终归不会有好下场。