鎌首

1. Origins, structure, and basic meaning

• Structure: Written 鎌首 and read かまくび, it denotes the sickle-curved neck of a snake raised upright.
• Basic usage: It is used for a snake holding an alert or threatening posture in grass.

2. Common pitfalls and similar expressions

• A conventional collocation
  • The word commonly appears with the verb meaning to raise the curved neck.