evacuation
瀉 centers on the forceful removal of something from within: evacuation, purging, or discharging. The single given meaning "evacuation" covers both physical and metaphorical emptying.
瀉 combines 氵 (water) with 寫, which historically relates to pouring or transferring. The compound suggests water being poured out or evacuated.
Water 氵 on the left and the complex right side 寫, which looks like a container being emptied. Imagine flushing water out of a system: evacuation.
For シャ, picture a sharp gush of water evacuating a pipe: the "sha" sound of rushing water cues シャ.
vomiting and diarrhea (diarrhoea)
bloodletting; phlebotomy
one swift effort; rush through one's work; fast-talking, writing, etc.
decanting
Pyrrosia tricuspis (species of felt fern)
antidiarrheal; antidiarrhoeal
antidiarrheal; antidiarrhoeal
threeleaf arrowhead (Sagittaria trifolia)
to have diarrhea
to have diarrhea
catharsis; purgation; evacuation; purging the bowels; diarrhea
laxative; cathartic; evacuant; purgative
epsomite; Epsom salt; magnesium sulfate
cathartic; purgative; laxative
diarrhea; diarrhoea
cathartic; purgative; laxative
plasmapheresis
supplementation, causing bowel movements, heating, and cooling (four main treatments of traditional Chinese medicine)