Meaning

verb to pass or move unobtrusively or smoothly

originFrom Middle English slitheren, alteration of slideren (“to slither, creep”), from Old English slidrian (“to slip, slide, slither”), from Proto-West Germanic *slidrōn (“to slide, slither”), from Proto-Indo-European *sleydʰ- (“to slip”), equivalent to slide + -er (frequentative suffix). Cognate with Dutch slidderen (“to slip, wriggle, slither”), German schlittern (“to slither, skid”). More at slide.

Etymology from Wiktionary, CC BY-SA 3.0