(idiom) (of one's speech) eloquent; articulate
出 · 5 strokes
Pictograph of a foot (止) exiting a cave (凵).
口 · 3 strokes
Pictograph of a mouth.
成 · 6 strokes
Depicts defending city walls (丁) with an axe (戌). 丁 also represents the sound. Based on the original meaning "city", now written as 城. The current meaning is a phonetic loan.
章 · 11 strokes
Possibly depicts using a blade (䇂) to engrave a block of jade. Based on the original meaning "jade ornament", now written as 璋. Later the meaning shifted to "seal" and "chapter".
他口才好,每次发言都出口成章。
With his great speaking skills, every speech he gives is eloquent.