猪首 is read as いくび (ikubi) and means bull neck.
いくび
ikubi
ちょく
sake cup
いのししどし
year of the Boar
ししうど
pubescent angelica (Angelica pubescens)
いぐち
bolete
いのししむしゃ
daredevil
しばりくび
(death by) hanging
きゅうしゅ
going into a huddle
しあんなげくび
being at one's wit's end
おぐらひゃくにんいっしゅ
Ogura Hyakunin Isshu
そくび
head
こうしゅ
hanging
かくしゅ
looking forward to