おっぱい（おっぱい、oっpai）
- breast

The word [おっぱい] is a Japanese term that refers to human breasts, specifically female breasts. It is a word that can be used in both everyday contexts, such as childcare or biology, and as an informal or colloquial term. While it originates as baby talk, it is widely understood and used by adults in casual conversation or pop culture.

Provide specific examples of how this word is used. ⚫︎赤ちゃんがおっぱいを欲しがっている。 Translation: The baby wants to drink milk / wants the breast. ⚫︎子供がおっぱいを飲んでいる。 Translation: The child is drinking milk from the breast.

This word is commonly used by mothers, children, and families when talking about breastfeeding or babies. It is also used casually among adults in humorous, lighthearted, or adult-entertainment contexts. Because it has a childish or informal nuance, it should be used with care depending on the social situation and the listener.

This word is most commonly written in hiragana as [おっぱい]. It can also be written in katakana as オッパイ, especially in manga, anime, or emphasis. There are no standard kanji characters specifically for this word, so hiragana and katakana are standard.

List similar words or synonyms. ⚫︎胸 ⚫︎乳房 ⚫︎バスト

There is no direct antonym for this word.

赤ちゃんだからおっぱいをたくさん飲む。 ・Translation: Because it is a baby, it drinks a lot of milk. ・Explanation: This sentence shows the natural, everyday use of the word in the context of infant care.

彼女はおっぱいが大きいです。 ・Translation: She has large breasts. ・Explanation: This sentence shows the casual adult usage of the word.

Explain the etymology or origin of the word. The term is derived from baby talk in Japanese, combining the polite prefix お with the root word ぱい, which is thought to be an onomatopoeic or simplified sound related to sucking or nursing used by infants.