From Old English 'fealdan' (to fold), from PIE *pel-to- — unchanged in meaning for millennia.
To bend something over on itself.
From Old English 'fealdan' (to fold, wrap), from Proto-Germanic *falþaną, from PIE *pel-to- (to fold). Remarkably stable in meaning for millennia. Key roots: *pel-to- (PIE: "to fold").