Chinese

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one; single; a
one; single; a; (before verbs) as soon as, once; (before a noun) entire (family, etc.)
 
to fall; to drop (behind); leave behind thousand zhang (unit of measurement)
trad. (一落千丈)
simp. #(一落千丈)
Literally: “to drop a thousand zhang in one fall”.

Pronunciation

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Idiom

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一落千丈

  1. (figurative) to suffer a devastating decline; to decline drastically
  NODES