1
only applies to
首, 頸, 頚
neck
その首と頭部はとてもやわらかかった。
Its neck and head were very soft.
2
only applies to
首, 頸, 頚
head
鳥は首をひょいと水に浸した。
The bird dipped its head into the water.
3
dismissal (from a job);firing;sacking
あなたの首は風前のともし火だ。
Your job hangs by a thread.
Other forms
頸 【くび】 (rarely used kanji form) · 頚 【くび】 (rarely used kanji form) · 馘 【くび】 (rarely used kanji form)