From Middle English slider, from Old English slidor (“slippery”), from Proto-Germanic *slidraz (“slippery”), from Proto-Indo-European *slidʰ-ró-s, from *sleydʰ- (“to slip, glide”). Related to Old English slīdan (“to slide”). More at slide.
From Middle English slyderen, slidren, from Old English sliderian (“to slip”), from Proto-Germanic *slidrōną (“to slide”), from Proto-Indo-European *sleydʰ- (“to slip”). Cognate with Middle Dutch slideren (“to drag, train”), German schlittern (“to slip, slide”).
- (dialectal or archaic) To slip or slide, especially clumsily, or in a gingerly, timorous way.
- He sliddered down as best as he could.
- To slither.