Senses
脚踏两只船/ 腳踏兩隻船 to have a foot in both camps
To sit on the fence, keep one's options open, or be non-committal; to dual-play for one's own benefit
脚踏两只船/ 腳踏兩隻船 to have an affair
To be unfaithful in a romantic relationship by dating two people at once