Left: earth 土, right: buttocks in side view 尸, to unite 并 (When coming out 丷 of a the gate 开 (= image of a toori) of a shinto-shrine you shall be united)
Mnemonic
Made of earth to unite the buttocks within: The wall or the fence.
The radical shikabane has the meaning: corpse 尸. But because of its use in tail 尾, buttocks 尻 or urine 尿, it is generally considered to mean "buttocks".
When you are coming out 丷 of a buddhist temple 开 you shall be united. - [开 = image of a temple's entrance gate with double upper traverses, which actually means "open 開", as these gates have no door]
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