also: びちょびちょ
noun which may take the genitive case particle 'no', na-adjective
Describes something thoroughly wet, often unpleasantly so. Common as びしょびしょだ, びしょびしょになる, or before a noun as びしょびしょの.
急な雨で服がびしょびしょになった。
My clothes got soaked in the sudden rain.
びしょびしょの靴下を脱いだ。
I took off my sopping wet socks.
adverb, adverb taking the 'to' particle
in a steady wet drizzle; with rain falling incessantly
Mimetic adverbial use, mainly with rain falling continuously or wetly. It is narrower than the adjective sense and is not a general adverb for all kinds of incessant action.
朝から雨がびしょびしょと降り続いている。
The rain has been falling in a steady wet drizzle since morning.