em·bit·ter /ɪmˈbɪtɚ/
  (vt.)使受苦,使難受,使怨恨,加苦味于
  Em·bit·ter v. t. To make bitter or sad. See Imbitter.
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  Im·bit·ter v. t. [imp. & p. p. Imbittered p. pr. & vb. n. Imbittering.]  [Written also embitter.] To make bitter; hence, to make distressing or more distressing; to make sad, morose, sour, or malignant.
     Is there anything that more imbitters the enjoyment of this life than shame?   --South.
     Imbittered against each other by former contests.   --Bancroft.
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  embitter
       v : cause to be bitter or resentful; "These injustices
           embittered her even more" [syn: envenom, acerbate]