acerbate

Pronunciation:		[adj]u'surbit, [v]'asur`beyt
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WordNet Dictionary

	Definition:	[v] make sour or bitter [v] cause to be bitter or resentful; "These injustices embittered her even more"

	Synonyms:	embitter, envenom

	See Also:	alter, change, resent

Webster's 1913 Dictionary

	Definition:	\A*cerb"ate\, v. t. [L. acerbatus, p. p. of acerbare, fr. acerbus.] To sour; to imbitter; to irritate.