slith‧er /ˈslɪðə $ -ər/
verb [intransitive always + adverb/preposition][
Language: Old English;
Origin: slidrian, from slidan; ⇒ slide1]
to slide somewhere over a surface, twisting or moving from side to side:
A snake slithered across the grass. He slithered down the muddy bank. [TahlilGaran] Dictionary of Contemporary English ▲