Crossword Genius

Is such grass nice to lie on? (5)

Ross

I believe the answer is:

couch

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But I can't explain it at all! Could you help me understand?

(Other definitions for couch that I've seen before include "Upholstered seat for more than one" , "Long seat; grass" , "Grass; reclining seat" , "Sofa or settee" , "express" .)

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