义冢

義塚
yìzhǒng
  1. potter's field
  2. pauper's grave

CEDICT

burial ground for the remains of unidentified persons

Wiktionary

掩埋无主尸体的坟墓。

重編國語辭典

Entry Composition

1 义 yì
  1. justice
  2. righteousness
  3. meaning
  4. foster (father etc)
  5. adopted
  6. artificial (tooth, limb etc)
  7. relationship
  8. friendship
=2 冢 zhǒng
  1. mound
  2. burial mound
  3. senior (i.e. eldest child or senior in rank)
=2 冢 zhǒng burial mound (variant of 冢 zhǒng)