Vietnamese edit

Etymology edit

Probably reduplication of (forest, mountain).

Pronunciation edit

Verb edit

ru

  1. (colloquial) to live in a small space; to stay indoors
    Thằng đó ru rú trong nhà cả năm nay rồi, có thấy mặt bao giờ đâu.
    He has been a hikikomori for a whole year, never let his face being seen.