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'.
This radical is used with the meaning "to collect", because helpful mnemonics become possible, as for example with " to collect 搂", which is ethymological not correct.
Vocabulary
屡次
lǚ cì
repeatedly; time and again
6345
屡见不鲜
lǚ jiàn bù xiān
a common occurrence (idiom)
6346
屡教不改
lǚ jiào bù gǎi
lit. not to change, despite repeated admonition; incorrigible; unrepentant
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