落汗

to stop sweating / (mahjong and card games) to mark the tiles or cards with one's sweat, fragrance etc

to leave out / to be missing / to leave behind or forget to bring / to lag or fall behind

colloquial reading for 落[luo4] in certain compounds

to fall or drop / (of the sun) to set / (of a tide) to go out / to lower / to decline or sink / to lag or fall behind / to fall onto / to rest with / to get or receive / to write down / whereabouts / settlement

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)