This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To vex or annoy.

adj. Embittered; having a sour disposition or nature.

v. To exasperate; to irritate.

v. To make bitter or sour.

v. To sour; to imbitter; to irritate.

To make sour, bitter, or harsh to the taste; hence, to embitter or exasperate.

Embittered; exasperated; severe.

v. cause to be bitter or resentful

v. make sour or bitter

"With the rating agencies calling even America's triple-A rating into question, not all the euro-zone summit meetings, of which there have been many and will be many more, can persuade lenders that it is a good idea to make capital available to Greece, or Portugal, or Ireland on terms that will not stifle growth in those countries and acerbate their downward spiral."

acerbated    acerbates    acerbating   

change    modify    alter   

acerbation   

sour    imbitter    irritate    provoke    embitter