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Jyutping lei4 tai4 maan6 zoeng6
Pinyin lí tī wàn zhàng

Definitions (Wiktionary)
  1. phrase, idiomatic
    to be completely off-topic
    (syn.) 离题万里, 離題萬里
Examples (粵典–words.hk)
  1. Cantonese
    离题万丈
    離題萬丈
    lei4 tai4 maan6 zoeng6
    • being offtopic