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The character 脅 evolved from ancient pictographs depicting multiple people (力) under a canopy or force, originally meaning 'to threaten' or 'to coerce.' In Liushutong, L29585 shows an early form with 劦 (three forces combined) under a cover, representing collective pressure or intimidation. Over time, it simplified to the modern 脅, retaining the core meaning of threat or menace, and extended to mean 'side of body' (as in ribs/脅腹) due to the vulnerable flank area. Arrived in Japan: The character likely arrived in Japan during the early waves of Chinese character introduction, around the 5th to 6th centuries CE via Buddhist texts and Korean scholars, becoming part of the Japanese kanji system with readings 'kyō' (as in 脅威 kyōi, 'threat') and 'obiyakasu' ('to threaten').