汗如雨下

sweating like rain (idiom); to perspire profusely / sweating like a pig

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

as / as if / such as

rain / CL:陣|阵[zhen4],場|场[chang2]

(literary) to rain / (of rain, snow etc) to fall / to precipitate / to wet

see 可汗[ke4 han2], 汗國|汗国[han2 guo2]

perspiration / sweat / CL:滴[di1],頭|头[tou2],身[shen1] / to be speechless (out of helplessness, embarrassment etc) (Internet slang used as an interjection)