树洞

Traditional form:

樹洞

Pinyin (reading):

shùdòng

Definitions:

• tree hollow
• (slang) anonymous platform for sharing secrets
• (slang) confidant

Characters:

• 树 - tree; to plant; to set up, to establish
• 洞 - cave, grotto, hole, ravine

Traditional characters:

• 樹 - tree; to plant; to set up, to establish
• 洞 - cave, grotto, hole, ravine