阻碍
zǔài · HSK 5
block
🚧 阻 = block + 碍 = obstruct; two near-synonyms stacked for emphasis
阻 (zǔ) carries 阝(mound/hill) + 且, suggesting a barrier of earth. 碍 (ài) carries 石 (stone) + 㝵, an obstructing rock. Together: a roadblock of hill-and-stone that hinders progress.