From ずぶ (zubu-) + 濡(ぬ)れ (nure, “連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 濡(ぬ)れる (nureru).”).
ずぶ濡(ぬ)れ • (zubunure)