Diào dāng 吊襠 or 吊裆 is translated as "Suspend your crotch" by Paul Brennan from the Taijiquan Treatise:
BODY STANDARDS
涵胸 拔背 裹襠 護肫 提頂 吊襠 騰挪 閃戰
– Contain your chest.
– Pluck up your back.
– Wrap your crotch.
– Shield your belly.
– Lift your headtop.
– Suspend your crotch.
– Always be ready.
– Get it over with in a flash.
There is a misconception between dang 襠 and kua 胯, kua is crotch while dang should be that something between your legs. Hanging that something between your legs should be the correct translation. The concept of wrap your crotch should be translate as wrap that something between your legs as well.