Meaning

noun a confused multitude of things

verb toss, roll, or rise and fall in an uncontrolled way

verb roll around,

originFrom Middle English welteren, equivalent to welt + -er (frequentative suffix). Cognates include German Low German weltern (“to wallow; roll”), Old Norse velta (Danish vælte), German wälzen, Gothic 𐍅𐌰𐌻𐍄𐌾𐌰𐌽 (waltjan). Akin to wallow and Latin volvō.

Etymology from Wiktionary, CC BY-SA 3.0