Definition of "heartburning" [heart•burn•ing]

• Heartburn (noun)
• Discontent; secret enmity (noun)

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• "Link ahhh… the heartwarming story of Cinderella and her transparent recipes for success… how heartburning.."
• "I cannot possibly pay for the damage I have done, and if the real cause of this is published, it will lead only to heartburning and the obstruction of my work."
• "None the less, the sacrifice she was now called on to make was a bitter one, and cost her much heartburning: when she first grasped the KIND of change Richard was tentatively proposing, she burst into heated exclamation."