Etymology
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slither (v.)

early 15c., variant of Middle English slidder "to slip, slide," from Old English slidrian "to slip, slide on a loose slope," a frequentative form of slidan "to slide" (see slide (v.)). For spelling change, compare gather. Meaning "to walk in a sliding manner" is attested from 1848. In reference to reptile motion, attested from 1839. Related: Slithered; slithering.

slither (n.)

"slithering movement," 1861, from slither (v.).

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Definitions of slither

slither (v.)
to pass or move unobtrusively or smoothly;
Synonyms: slide
From wordnet.princeton.edu