Definition of 海底撈月 (かいていろうげつ)
かいていろうげつ
                        海底撈月
かいていろうげつ
kaiteirougetsu
noun
•
        
totally useless (fruitless) effort, wasting time on an impossible task (like trying to scoop up a reflected moon from the bottom of the sea)(yojijukugo)
Related Kanji
| 海 | sea, ocean | 
| 底 | bottom, sole, depth, bottom price, base, kind, sort | 
| 撈 | catch fish | 
| 月 | month, moon |