kill

(katakana 'me') + (tree) + (throw)
★★★★☆
10 strokes

Onyomi

SATSU

I SAW TWO killers escape from the prison.

Mnemonic

The killer threw the victim's body in a tree and left it there.

Kunyomi

ころ*す kill
★★★★☆

Jukugo

自殺(じさつ)

suicide ★★★★☆
(my own) + (kill) = 自殺 (suicide)

殺人(さつじん)

murder ★★★★☆
(kill) + (person) = 殺人 (murder)

Despite having "人" in it, this word just means the act of murder.
A murderER is a 殺人者 - satsujinMONO.

暗殺(あんさつ)

assassination ★☆☆☆☆
(dark) + (kill) = 暗殺 (assassination)

Synonyms

idly, stand by
見兼ねてxxx    見殺し    勘弁出来ない    たまるか