- 腹背受敌 fùbèishòudí to be attacked from both sidesto be attacked from both the front and the rear; caught between two fires
- 腹背之毛 fùbèizhīmáo a triflesomething completely insignificant; a matter of no importance or weight
- 腹背相亲 fùbèixiāngqīn very intimateto be on very intimate terms with someone