1.
nape of the neck; scruff; collar area
The back of the neck near the collar. Often used in the context of grabbing someone by the collar or scruff.
襟首をつかまれた。
I was grabbed by the scruff of the neck.
Literally the area where the collar (襟) meets the neck (首). Most commonly appears in the phrase 襟首をつかむ (to grab by the scruff).
Common collocations
The word evokes a forceful, physical action — often used when describing someone being restrained or dragged. In figurative usage, it can suggest being caught or cornered.