To either succeed or fail, without any help or support.
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To be left to succeed or fail entirely on your own.
When someone faces a sink-or-swim situation, there’s no safety net — they must figure it out themselves or fail.
It often describes moments where someone is thrown into the deep end without training or guidance.
"Do or Die"
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A high-stakes situation where failure has serious unavoidable consequences
"Trial by Fire"
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Learning something difficult by being thrown into a hard situation
"Sink or Swim"
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Succeed or fail with no outside help or safety net