成语
chéng yǔ · HSK 5
idiom
📜 成 (become/complete) + 语 (speech/saying) = a 'completed saying'
成 means to become or accomplish; 语 means speech or words. Together: a fixed, fully-formed expression. Most 成语 are four characters and condense a whole story or historical episode into a stock phrase.
成 — 戊 (halberd/weapon) + 丁 (nail/man)
Originally a pictograph of a halberd or axe-like weapon, suggesting the act of completing a task by force. Over time it shifted from 'to subdue' to the broader meaning 'to accomplish' or 'to become'. The 丁 element inside also hints at the chéng sound.