断 (Kanji for decision/judgement/refuse)

This means decision, but also means to judge, refuse, or cut off. Kind of related, but not really!

Onyomi

DAN

Glen DANzig decided to cut up the loser (who stole his rice) with his axe.

ことわ*る	the most common word for 'refuse' ★★★☆☆
た＊つ	to sever a thing, or to divide something in two.　Can also be used figuratively, as in 'Cut off all contact with so-and-so.' or 'Quit smoking altogether forever.' ★★☆☆☆

判断(はんだん) する

judge ★★★☆☆
判 (judgement) + 断 (decision/judgement/refuse) = 判断 (judge)

to judge, to deliver a verdict - but also judge like 'I wouldn't wear that skirt if I was her.'

診断(しんだん) する

diagnosis ★★☆☆☆
診 (diagnose) + 断 (decision/judgement/refuse) = 診断 (diagnosis)

diagnosis (診断する＝to diagnose)

油断(ゆだん) する

let down your guard. ★★☆☆☆
油 (oil) + 断 (decision/judgement/refuse) = 油断 (let down your guard.)

You pray for a NECROPHILIAC mortician,

but you fold origami with your HAND.

The RICE refused . . .to analyze the TREE.

deny, reject
断る否定拒否拒むボツにする却下

examination or investigation
調べる検査調査検討診断査定検索

judge someone
偏見判断先入観判決裁く審査

quit
断つ辞めるあきらめる

to sever something
絶つ断つ