banister; balustrade; cage for animal or prisoner; to transport caged prisoner on a cart

door sill; threshold

(architecture) doorsill

cage (for animals)

railings of a balcony

railing; fence; banisters

see 闌檻|阑槛[lan2 jian4]

nuclear threshold

(idiom) Zhu Yun breaks the railing (Zhu Yun was a Han Dynasty official who accused the emperor's tutor of corruption, and when sentenced to death, clung to the palace hall railing so fiercely while demanding justice that he broke it); (fig.) to speak the truth with unwavering courage; to admonish fearlessly; also pr. [zhu1yun2-she2jian4]

cloud around the window, mist on the threshold (idiom); tall building with the windows in the clouds

to wear out the doorstep (idiom); to crowd at sb's door

carved pillar, jade doorsill (idiom); heavily decorated environment