To suddenly take away support or change plans, leaving someone in a difficult or disappointing situation.
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To suddenly remove support or assistance from someone without warning.
When you pull the rug out from under someone, you take away something they were depending on, leaving them in a difficult position.
It always implies a sudden and unexpected move.
"Leave Someone in the Lurch"
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To abandon someone who needed your help, not always suddenly or without warning
"Pull the Plug"
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To stop something from continuing, without necessarily leaving someone without support
"Pull the Rug out from Under Someone"
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Suddenly and unexpectedly removing support from someone who was depending on it