洗蕩 [－荡]

Jyutping sai2 dong6
Pinyin xǐ dàng

Definitions (Wiktionary)
  1. verb, archaic
    to annihilate; to massacre; to wipe out
  2. verb, Min-Nan
    to wash; to cleanse
    (syn.) 洗汏, 洗涤, 洗滌