recum+bent => sounds similar like become+bent. you become bent while sitting means you lie down.
recumbent -> re (phir) + cum (kamar means back) + bent. Apni kamar phir se bent karo means lie down.
Ray only cums when he's bent over or re-cum-bent. (Apologise for the graphical nature of this mnemonic, but I'm sure you'll agree that you'll remember it now!)
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