embitter

From em- +‎ bitter.

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embitter (third-person singular simple present embitters, present participle embittering, simple past and past participle embittered)

1. (transitive) To cause (someone or something) to be bitter; to envenom.
   • 1837, L[etitia] E[lizabeth] L[andon], “The Sick-Room”, in Ethel Churchill: Or, The Two Brides. […], volume III, London: Henry Colburn, […], →OCLC, page 155:

     She was at once humiliated and embittered; but the warm heart, and the strong mind, must have an object; and her energies, equally with her affections, had concentrated themselves on her son.

   • 1838, [Edgar Allan Poe], chapter XII, in The Narrative of Arthur Gordon Pym of Nantucket. […], New York, N.Y.: Harper & Brothers, […], →OCLC, page 107:

     It is with extreme reluctance that I dwell upon the appalling scene which ensued; a scene which, with its minutest details, no after events have been able to efface in the slightest degree from my memory, and whose stern recollection will imbitter every future moment of my existence.

• imbitter (obsolete)

• embetter
• acerbate