水底 shuǐdǐ bottom of the water Origin Definitions Defs Strokes Stroke Words Sentences Sents 水底捞月 shuǐdǐlāoyuè to do something in vain to fish the moon out of the water; used to describe a futile effort or a waste of energy水底相机 shuǐdǐxiàngjī underwater camera a camera designed to be used while submerged in water