From Old English hlid 'cover,' from PIE *klei- 'to lean' — a lid is something that leans over an opening.
A removable cover for the top of a container; also, an eyelid.
From Old English hlid 'lid, cover, gate, opening,' from Proto-Germanic *hlidą 'cover,' from PIE *klei- 'to lean, incline.' A lid was originally anything that leaned over or covered an opening. The 'eyelid' sense comes from the same word. Key roots: *klei- (Proto-Indo-European: "to lean, cover").