To continue until something is finished, no matter what.
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Until the very end, no matter how hard or unpleasant it becomes.
When you stay to the bitter end, you see something through completely, even when it's difficult or painful.
It implies determination, loyalty, or sheer stubbornness.
"Against All Odds"
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Succeeding despite low chances, not about staying until the end
"See It Through"
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Completing something, but without implying it was painful or difficult
"To the Bitter End"
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Staying until the very end despite ongoing difficulty or pain