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Jyutping mou4 dai2 dung6
Pinyin wú dǐ dòng

Definitions (CC-CEDICT)
  1. bottomless pit
Definitions (Wiktionary)
  1. noun, figuratively, literally
    bottomless pit; abyss; insatiable thing
    (syn.) 無底止, 无底止
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    恶魔一把抓住了我的妹妹,一边狰狞地狂笑着,一边把她丢进了一个无底洞里。
    惡魔一把抓住了我的妹妹,一邊猙獰地狂笑着,一邊把她丟進了一個無底洞裏。
    è mó yī bǎ zhuā zhù le wǒ de mèi mei , yī biān zhēng níng dì kuáng xiào zhe , yī biān bǎ tā diū jìn le yí gè wú dǐ dòng lǐ 。
    • The demon grabbed my sister and, with howling laughter, cast her into a bottomless pit.