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drinking poison and waiting for someone else to die of it

means A lingering bitterness or indignation held against someone for a perceived wrong, replayed and nursed over time.

from From French 'ressentiment,' from 'ressentir' — to feel again, to feel intenselybuilt from the intensive prefix 're-' and 'sentir,' 'to feel' (from Latin 'sentire'). At its root it literally means a re-feeling: an emotion you go back and feel once more, and once more, until it sours.

latin rootsentire, to feel — but feeling it again and again
body costchronic grudges raise blood pressure and cortisol
nietzsche's wordhe called it ressentiment, morality's secret engine
memory biasthe brain replays offenses sharper than kindnesses
forgiveness studiesletting go measurably lowers heart rate
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