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aslope

/əˈsləʊp/ adjective

Origin

From Middle English aslop, aslope (“at an angle or slant; aside”); further etymology uncertain, probably either: * from Old English āslopen (“slipped away”), the past participle of āslūpan (“to slip away”), from ā- (prefix meaning ‘away; from; off; out’) + slūpan (“to glide, slip”) (from Proto-West Germanic *sleupan (“to move stealthily, creep, sneak”), from Proto-Germanic *sleupaną (“to move stealthily, creep, sneak”), probably either from Proto-Indo-European *slewbʰ- (“to glide, slide, slip”) or *slewp- (“to glide, slip”)); or * from Middle English a- + *slope (adjective).

From Wiktionary, via Kaikki.org (CC BY-SA)