Tūnkǒu (吞口)

Literally "swallowing mouth", a collar piece often found on Chinese blades.

Ulhun

Manchu for tūnkǒu (吞口), a collar piece on the base of a sword or saber blade.

Dāo tūnkǒu (刀吞口)

Qing Chinese term for the collar-piece found on some Chinese sabers.