acerbate

Verb
  1. Cause to be bitter or resentful (synset 201777456)
    "These injustices embittered her even more"
    causes: resent - feel bitter or indignant about
    same as: embitter, envenom
  2. Make sour or bitter (synset 200271239)
    is a type of: alter, change, modify - cause to change; make different; cause a transformation

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