- 比翼双飞 bǐyìshuāngfēi to fly side by side(of a couple) to be deeply in love and inseparable, going everywhere together
- 双宿双飞 shuāngsùshuāngfēi to be inseparable(idiom) literally "resting and flying together"; used to describe a couple who are deeply in love and always stay by each other's side
- 双飞脚 shuāngfēijiǎo double kicka kicking technique in martial arts or sports where both legs are used in mid-air