To recognize a weakness in someone that you can take advantage of.
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To sense that someone is weak and move in on them.
When someone smells blood in the water, they spot a chance to win because the other side is struggling.
It is used in business, sports, and politics.
"Go in for the Kill"
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To make a final decisive move to defeat someone
"Kick Someone While They're Down"
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To attack someone who is already suffering
"Smell Blood (in the Water)"
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To detect weakness in an opponent and prepare to exploit it