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head
「頭」 has other readings with different meanings.
静かにこうべを垂れた。
I quietly bowed my head.
こうべを上げて遠くの山を眺めた。
I raised my head and gazed at the distant mountains.
実るほどこうべを垂れる稲穂のように謙虚でいたい。
I want to be humble, like rice stalks that bow the more they ripen.