足首（あしくび、ashikubi）
- ankle

The word 足首 足首 refers to the ankle. It is the joint connecting the foot to the leg, specifically the narrow part just above the foot.

⚫︎足首をひねってしまいました。 Translation: I twisted my ankle. ⚫︎ サンダルは足首までストラップが付いているものが好きです。 Translation: I like sandals that have straps up to the ankle. ⚫︎ 彼は足首を骨折しました。 Translation: He fractured his ankle.

This word is used in everyday conversation to describe the ankle, injuries to the ankle, or things related to the ankle, such as clothing or accessories. It's a common and practical term.

⚫︎ The word is typically written with the kanji 足 (ashi - foot/leg) and 首 (kubi - neck/joint). ⚫︎ The reading is あしくび in hiragana. ⚫︎ There are no other common ways to write this word. The okurigana is standard.

There aren't many direct synonyms for 足首, as it is a specific body part. You might use more descriptive phrases if you are trying to avoid the word 足首 or emphasize a particular aspect. For instance, 足の関節（足のかんせつ - ashi no kansetsu - ankle joint).

There aren't any direct antonyms for 足首.

ジョギング中に、地面の凹凸につまずいて足首を痛めてしまいました。》 ・Translation: While jogging, I tripped on an uneven surface and injured my ankle. ・Explanation: This sentence describes an injury to the ankle due to a stumble while jogging.

新しいブーツは足首のサポートが良い。》 ・Translation: The new boots have good ankle support. ・Explanation: This sentence refers to the support the boots provide to the ankle.

The word 足首 is a compound word. 足 (ashi) means "foot" or "leg," and 首 (kubi) means "neck" or "joint." It's a descriptive term because it visually equates the narrow part of the leg above the foot to the neck.