From Middle English ladder, laddre, from Old English hlǣder, from Proto-Germanic *hlaidrijō (compare Scots ledder, North Frisian ladder, Saterland Frisian Laadere, West Frisian ljedder, Dutch ladder, leer, German Leiter), from Proto-Indo-European *ḱleytro (compare Old Irish clithar ("hedge"), Umbrian 𐌊𐌋𐌄𐌈𐌓𐌀𐌌 ("stretcher")), from Proto-Indo-European *ḱley- ("to lean#Verb"). See [[lean, which is related to lid.
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