首（くび、kubi）
- neck

The Japanese word 首 (くび) primarily means "neck." It refers to the part of the body connecting the head to the torso. Additionally, 首 can have figurative meanings.

⚫︎ 首が痛い。 Translation: My neck hurts. ⚫︎ あの選手は首位を走っている。 Translation: That player is in the lead. (Figurative: Neck and neck with the competition) ⚫︎ 首になる。 Translation: To be fired; to lose one's job. (Figurative: Head is cut off from the body of work)

⚫︎ 首 is used in everyday conversation to describe the physical neck. ⚫︎ It's also used in more formal or figurative contexts. ⚫︎ Pay attention to the context to understand the intended meaning (physical neck or a different meaning like "lead" or "firing").

⚫︎ The word is most commonly written with the kanji 首. ⚫︎ It is read as くび in hiragana. ⚫︎ The kanji 首 is composed of the radical 首 (itself) and represents the meaning of "head" or "beginning". ⚫︎ There are no common variations in okurigana.

⚫︎ While there aren't direct synonyms for the physical "neck," you could use phrases to describe its location. ⚫︎ For figurative meanings, synonyms depend on the context (e.g., 先頭 (せんとう) - lead, 解雇 (かいこ) - dismissal)

⚫︎ For the physical neck, there are no direct antonyms. ⚫︎ For the figurative meanings, the antonyms would depend on the specific context. For example, regarding being fired, it would be "hired" 採用 (さいよう).

彼は交通事故で首を怪我した。 ・Translation: He injured his neck in a traffic accident. ・Explanation: This sentence uses 首 to refer to the physical neck and an injury to it.

社長は業績不振の責任を取って首になった。 ・Translation: The president was fired for taking responsibility for the poor performance. ・Explanation: This sentence uses 首 figuratively to mean that the president lost his job.

The kanji 首 is a pictograph representing a person's head. The etymology is directly related to the physical meaning of "neck" and, by extension, the head it supports.