noun
Very casual, often vulgar word for the buttocks. Used among close friends or in rough speech.
転んでケツを打った。
I fell and hit my ass.
あいつ、ケツがでかいな。
That guy has a huge butt.
noun
Extended from the body part to mean the rear or end of something, often in a rough or casual tone.
行列のケツに並んでください。
Please line up at the end of the queue.
車のケツがぶつかった。
The rear of the car got hit.
noun
Only when written 穴
Technical term in acupuncture, using the kanji 穴. Not used in everyday conversation.
このツボは経穴の一つです。
This pressure point is one of the acupuncture points.
counter
Only when written 穴
Counter for holes or notches, using the kanji 穴. Rare and specialized.
ベルトに穴を一つ開けた。
I made one hole in the belt.
Kanji spelling for the body part, but very rare; usually written in kana.
The origin is uncertain. Possibly related to the reading of 尻 (しり) or a sound-symbolic word. The kanji 穴 (hole) is used for the acupuncture and counter senses, while 尻 (buttocks) is rarely used for the body part sense.