乍

乍 is considered an ideographic or simple form representing a sudden or momentary action. Its structure suggests something appearing or happening abruptly, which led to meanings like “suddenly” or “momentarily.”
Semantic development: - sudden occurrence; - short duration; - brief or temporary state.

乍 is rarely used in modern Korean vocabulary, but appears in classical contexts with the meaning “briefly” or “suddenly.”

The character conveys a nuance of suddenness combined with brevity. In Chinese, 乍 is commonly used in expressions like 乍看 (at first glance). In Japanese, it appears in 乍ら (ながら), meaning “while” or “although.”
Related characters: 忽 — suddenly

暫 — temporarily

瞬 — moment; instant