高牆

高墙
gāoqiáng
  1. (literally) high wall
  2. (metonymic) prison
  3. high wall
  4. prison

Wiktionary

Entry Composition

=1 高 Gāo surname Gao
=1 高 gāo
  1. high
  2. tall
  3. above average
  4. loud
  5. your (honorific)
2 牆 qiáng (slang) to block (a website) (usu. in the passive: 被牆 bèiqiáng)

classifiers: 面, 堵