畅通
chàng tōng · HSK 6
unimpeded
🛣️ 畅 = smooth/unimpeded + 通 = pass-through
畅 carries the sense of free and flowing (also in 畅快 carefree); 通 means to pass through or connect. Together: a route or flow that passes through without blockage — used for traffic, communication, or pipes running clear.
通 — 辵 (辶) walk + 甬 yǒng (phonetic)
通 is a semantic-phonetic compound. The 辶 (chuò) component means 'walk' or 'movement', giving the meaning of going through or passing. 甬 (yǒng), originally depicting a hanging bell or a path, supplies the sound. Together they convey 'to pass through, communicate, connect'.