背中: back (body)

重おもい荷物にもつのせいで背中せなかが痛いたい。

My back hurts because of the heavy luggage.

背中せなかには、こけや木きが生はえていて、八やっつの谷たにと八やっつの丘おかをおおうほど長ながかったといいます。

Moss and trees grew on its back, and it is said to have been long enough to cover eight valleys and eight hills.

「仲間なかまの数かずをくらべよう」と言いって、和邇わにをならばせて、数かぞえるふりをしながら、背中せなかの上うえをとんで渡わたったのです。

It said, “Let us compare how many of us there are,” made the wani line up, and crossed by jumping over their backs, pretending to count.