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Han character

 * 1) threshold
 * 2) separated, confined

Definitions

 * 1)  threshold; doorsill; doorstep; doorway
 * 2)  limits; confines; boundary

Kanji

 * 1) threshold

Etymology 1
From. Compare modern 🇨🇬.

The goon pronunciation, so likely the initial borrowing.

Noun

 * 1) threshold

Affix

 * 1) threshold

Derived terms

 * : subliminal