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rack2
1 [transitive usually passive] to make someone suffer great mental or physical pain :
2 to try very hard to remember or think of something : 
I racked my brains, trying to remember his name.
rack your brains
I racked my brains, trying to remember his name.rack something ↔ up
phrasal verbPPVDS to get a number or amount of something, especially a number of points in a competition : He racked up 41 points.
He racked up 41 points.