The abdomen or belly; the front part of the torso that contains the digestive organs (often called おなか in casual speech).
朝ごはんを食べたら腹がいっぱいになった。
After breakfast I felt full in my stomach.
医者は腹の痛みの原因を調べるために超音波検査をした。
The doctor did an ultrasound to check the cause of the abdominal pain.
寒さで腹が冷えてお腹を壊した。
My stomach got chilled by the cold and I got an upset stomach.
The womb; the uterus (used in literary or medical contexts).
妊娠中は腹の中で胎児が成長する。
During pregnancy the fetus grows in the womb.
古い文献では『腹に宿る』という表現が見られる。
In old literature you can find the expression 'to harbor in the womb.'
One's inner mind or true intentions; what a person really thinks or intends.
彼の腹は読めない。何を考えているのか分からない。
You can't read his mind; you don't know what he's thinking.
腹の中を明かして、正直に話した方がいい。
It's better to open up and speak honestly about what's in your heart.
表面では笑っていたが、腹の中では怒っていた。
He was smiling on the surface, but was angry inside.
Courage or nerve; the willpower or resolve to face difficulties (e.g., expressions like 腹を据える, 腹をくくる).
大事な試合の前に腹を据えて練習に取り組んだ。
Before the important match, he steeled himself and practiced hard.
失敗を恐れずに腹をくくって挑戦した。
He took a deep breath and challenged it without fear of failure.
腹が座っている人は慌てない。
A person with nerves of steel doesn't panic.
Generosity or magnanimity; being broad-minded (as in expressions like 腹が広い).
彼は人の失敗を許す腹が広い人だ。
He is broad-minded and forgives others' mistakes.
腹の大きい指導者がチームをまとめた。
A magnanimous leader held the team together.
Feelings or emotions; often appears in expressions that denote emotional states (e.g., 腹を立てる).
彼の一言で腹が立った。
That one remark of his made me angry.
腹の虫が治まらず、どうしても我慢できなかった。
My anger wouldn't subside and I simply couldn't hold back.
気持ちを抑えきれずに腹を割って話した。
Unable to hold back my feelings, I spoke frankly.
The wide middle or bulging part of an object; the belly of containers like pots or vases.
その古い壺は腹の部分に見事な模様が刻まれている。
The old vase has a beautiful pattern carved on its belly.
瓶の腹がふくらんでいるデザインが人気だ。
A design with a bulbous body on the bottle is popular.
The inside or interior part; the inner section of something (e.g., 山の腹 = the mountainside/mid-slope).
山の腹に古い神社が建っている。
An old shrine stands on the mountainside.
箱の腹に隠し部屋があった。
There was a hidden compartment inside the box.
In physics, an anti-node: a point of maximum amplitude in a standing wave (technical term).
弦の振動では腹（アンチノード）と節（ノード）が交互に現れる。
In string vibrations, antinodes and nodes appear alternately.
Suffix/counter used for sacs of roe (e.g., counting roe sacs); a dialectal or specialized counting unit.
漁師はその鮭を三腹（さんばら）と数えた。
The fisherman counted that salmon as having three roe sacs (three 'bara').
Suffix/counter for containers with bulging middles (pots, vases, etc.); used in contexts like antiques or ceramics.
この骨董屋には壺が二腹並んでいた。
Two bulbous jars stood side by side in this antique shop.