堵塞
dǔ sè · HSK 7
to clog up
🚧 dǔ sounds like DO, sè sounds like SET — DO SET up a barricade
土 (earth) + 者 (person) = someone piling earth. 塞 means to stuff or block. Together: earth piled up to stuff a passage shut, creating a blockage.
堵 — earth radical 土 + 者 (phonetic)
A semantic-phonetic compound: 土 (earth) supplies the meaning, since walls and barriers were built from packed earth, while 者 hints at the sound. The original sense was a wall or embankment, which extended naturally to the modern meaning of blocking, stopping up, or obstructing.
塞 — roof 宀 + 共 (hands) over 土 + 土
Originally depicted hands stuffing material between bricks under a roof to block gaps, giving the core sense 'to stop up' or 'block.' From this came extended meanings like 'frontier pass' or 'stronghold' (a blocked, fortified place), read sài. The reading sè keeps the verbal sense 'to fill in, plug.'