ac·er·bate /ˈæsɚ/
  (vt.)使發怒,使煩惱(a.)惱怒的
  A·cerb·ate v. t.  To sour; to imbitter; to irritate.
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  acerbate
       v 1: cause to be bitter or resentful; "These injustices
            embittered her even more" [syn: embitter, envenom]
       2: make sour or bitter