Left: earth 土, right: empress, behind 后 (Originates in the custom that the empress followed behind the emperor. shows: buttocks 尸 with anus 口 for: "behind": The one following 'behind' is the empress.)
Mnemonic
What comes to the ground from the buttocks' anus, is: dirt.
This radical has actually the meaning: corpse 尸. But due to its use in tail 尾, urine 尿, or flatulence 屁, it is considered to generally mean 'buttocks'.
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
Vocabulary
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污垢
wū gòu
filth
水垢
shuǐ gòu
limescale
除垢剂
chú gòu jì
detergent
澡垢索疵
zǎo gòu suǒ cī
to wash the dirt to find a defect (idiom); to find fault; to nitpick
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