1) Act like a snake 2) Crawl like a snake 3) Fictional reptilian 4) Locomote 5) Move 6) Move along sinuously 7) Move like a mamba 8) Move like a rattler 9) Move like a serpent 10) Move like a sidewinder 11) Move like a snake 12) Move like ophidians 13) Move snakily 14) Sexy walk 15) Slide 16) Slide like a sidewinder Found on https://www.crosswordclues.com/clue/slither
Slith'er intransitive verb [ Confer German schlittern , LG. schliddern . See Slide .] To slide; to glide. [ Prov. Eng.] Found on http://www.encyclo.co.uk/webster/S/123