堵 Strokes Write it Listen 堵 dǔ to block up (a road, pipe etc); to stop up (a hole) HSK 4 11 strokes Radical 土 Sound + meaning 3 words Built from土meaningtǔsoil, earth; items made of earth者soundzhěthat which; they who; those who How it works土 hints at the meaning (earth), and 者 zhě hints at the sound.