This isn't a direct meaning, it's poetical. I am bound or sewn in something, thus I can't move, can't do anything.
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AnnvanI wonder if "sewn" here is short for "sewn up"... The phrase "to sew something up" (informal) can mean to gain exclusive control over something. So "You've got me sewn" could mean "You've got complete control over me".Sounds good.