noun
opening; mouth (of a container)
Refers to the opening or mouth of a bag, bottle, or similar container.
袋の口部分をしっかり閉じてください。
Please close the opening of the bag tightly.
noun
mouth area; area around the mouth
Refers to the area around a person's or animal's mouth.
赤ちゃんの口部分をやさしく拭いてあげた。
I gently wiped the baby's mouth area.