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1.
compound contraction of "could not have"
She couldn't've done it, she's way too stupid for a plan that complex! Also see wouldn't've and shouldn't've.
by Sunob August 29, 2007
22 12
 
2.
Conjunction-- could not have
it couldn't've gone any worse.
by No one needs to know that! July 30, 2011
3 3