ショウ, き.える, け.す
extinguish, blow out, turn off, neutralize, cancel
JLPT3 G3 S10 F345
As per 肖# (resemble in miniature) + 水 water → *extinguish* a burning object with water, leaving the original object in reduced form → *go out*; *disappear*; *grow thin*; *dwindle*; *decline* → *put out*; *turn off*; *kill* (off); *erase*. Also, *die* (← be killed off) and *spend* (← spend time ← extinguishing of a day).
[Full Kanji Etymology List]