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Verb: embitter  em'bi-tu(r)
  1. Cause to be bitter or resentful
    "These injustices embittered her even more";
    - envenom [archaic], acerbate

Derived forms: embitters, embittering, embittered

Type of: cast down, deject, demoralise [Brit], demoralize, depress, dismay, dispirit, get down