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Use "imbittering" in a sentence
"He had little affection for that sister left — for she had used him cruelly, and even now was imbittering the injury — but he still had some tender feeling for the other, who had always been his favorite."
"Before man attains wealth or honour, those who had most rejoiced to witness it have passed away; while still, fair as is the outward lot, there are internal sorrows, imbittering every pleasant draught, and casting a shadow over all the brightness of human existence."
"The most imbittering and offensive thing that _can ever be done_ to those men _is done_ the moment you pronounce the words of freedom and human rights, in conjunction with each other, as if they were the same thing."