脱节
tuō jié · HSK 7
to come apart
🔗 脱 shed/slip-off + 节 joint = the joints slip apart from each other
脱 means to shed or slip off (as in 脱衣 take off clothes), and 节 is a joint or segment (as in 关节 joint). When the joints slip off one another, things come apart or fall out of sync.
脱 — flesh radical 月 (肉) + 兑 tuì (phonetic)
脱 is a semantic-phonetic compound. The flesh radical 月 (from 肉) signals the body, while 兑 supplies the sound. Originally it meant shedding flesh or skin, like a snake molting, and broadened to mean 'to take off, slip off, or escape.'
节 — bamboo radical 竹 (⺮) + 即
Originally written 節, depicting a bamboo joint — the segmented node where a stalk divides. The bamboo radical ⺮ gives the meaning, while 即 supplies the sound. From 'bamboo joint' the meaning expanded to any segment, hence 'section,' 'festival' (a marked point in the year), and 'restraint' (knowing where to stop).