甲之蜜糖，乙之砒霜

jiǎzhīmìtáng,yǐzhīpīshuāng
one man's meat is another man's poison (idiom)

CEDICT

Entry Composition

1 甲 jiǎ
  1. first of the ten Heavenly Stems 十天干 shítiāngān
  2. (used for an unspecified person or thing)
  3. first (in a list, as a party to a contract etc)
  4. letter "A" or roman "I" in list "A, B, C", or "I, II, III" etc
  5. armor plating
  6. shell or carapace
  7. (of the fingers or toes) nail
  8. bladed leather or metal armor (old)
  9. ranking system used in the Imperial examinations (old)
  10. civil administration unit in the baojia 保甲 bǎojiǎ system (old)
  11. ancient Chinese compass point: 75°
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
3 蜜糖 mìtáng honey
4 乙 yǐ
  1. second of the ten Heavenly Stems 十天干 shítiāngān
  2. second in order
  3. letter "B" or Roman "II" in list "A, B, C", or "I, II, III" etc
  4. second party (in legal contract, usually 乙方 yǐfāng, as opposed to 甲方 jiǎfāng)
  5. ethyl
  6. bent
  7. winding
  8. radical in Chinese characters (Kangxi radical 5)
  9. ancient Chinese compass point: 105°
5 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
6 砒霜 pīshuāng
  1. white arsenic
  2. arsenic trioxide As2O3