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to expel (from the body); to excrete; to defecate; to give birth
赤ちゃんがミルクの後におならをひった。
The baby passed gas after drinking milk.
犬が散歩中に道端でひることがある。
The dog sometimes relieves itself on the roadside during walks.
猫が庭の隅でひった跡を見つけた。
I found traces of the cat having relieved itself in the corner of the garden.