To make someone's bad situation worse or remind them of their pain.
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To make a bad situation hurt even more.
When you rub salt in the wound, you point at the pain instead of letting it heal.
It is often careless, but it can be cruel on purpose.
"Twist the Knife"
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Very similar — making something worse; twisting the knife implies more deliberate cruelty
"Add Insult to Injury"
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Also means making things worse — nearly identical; rubbing salt in the wound feels more physical and vivid
"Rub Salt in the Wound"
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Making an already painful situation even worse, often through a careless or cruel action