殺 means “kill”

ころす · korosu

Also: murder, butcher, slice off

Kun'yomi (Japanese reading)
ころす, そぐ, あやめる
On'yomi (Chinese reading)
サツ, サイ, セツ

JLPT N3 · Taught in grade 5 · 10 strokes

The story

Picture a hand swinging a club (殳) at a tree (木) slashed with a cross (乂): something cut down for good. 殺す is to kill and 殺人 is murder, yet 殺到 is just a rush, like orders flooding in on sale day.

Used in 殺す (korosu, to kill), 殺人 (satsujin, murder), and 殺到 (sattou, rush/flood)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.