ACERBATE
acerbate
(verb) make sour or bitter
embitter, envenom, acerbate
(verb) cause to be bitter or resentful; “These injustices embittered her even more”
Source: WordNet® 3.1
Etymology
Adjective
acerbate (comparative more acerbate, superlative most acerbate)
(rare) Embittered; having a sour disposition or nature.
Verb
acerbate (third-person singular simple present acerbates, present participle acerbating, simple past and past participle acerbated)
(transitive) To exasperate; to irritate.
(transitive) To make bitter or sour.
Synonyms
• (exasperate): provoke
• (make bitter): sour, embitter
Source: Wiktionary
A*cerb"ate, v. t. Etym: [L. acerbatus, p. p. of acerbare, fr.
acerbus.]
Definition: To sour; to imbitter; to irritate.
Source: Webster’s Unabridged Dictionary 1913 Edition