窍门
qiào mén · HSK 7
know-how
🔑🚪 窍门 = 窍 (opening/knack) + 门 (door): the little doorway that lets you in on the trick
窍 means an aperture or the knack of something; 门 is a door or gate. Together they name the hidden little opening that gets you past a problem — the know-how, the inside route others miss.
门 — pictograph of double-leaf gate
门 is a pictograph showing a pair of swinging doors hung in a doorway, originally drawn as 門 in oracle-bone script with two clear leaves. The simplified form 门 keeps the same outline with fewer strokes. It still means 'gate' or 'door' and serves as a phonetic in characters like 们, 问, and 闷.