Exacerbate \Ex*ac"er*bate\, v. t. [imp. & p. p. Exacerrated; p. pr. & vb. n. Exacerrating.]

[L. exacerbatus, p. p. of exacerbare; ex out (intens.) + acerbare. See Acerbate.]

To render more violent or bitter; to irriate; to exasperate; to imbitter, as passions or disease. --Broughman.

Source: Webster's Revised Unabridged Dictionary (1913)