the verb 'spurn' originates from old english 'spurnan', 'spornan', meaning to kick, reject, or spurn. it can be traced back to the proto-germanic root 'spurnan-', and further to the proto-indo-european root '(s)per-', meaning to kick or twitch. the core action of striking with the foot evolved metaphorically into the sense of rejecting something with contempt, as if kicking it away. this semantic shift from a physical to a figurative rejection is a clear and logical progression, giving us the modern meaning of disdainful refusal.

this word is a simplex form derived from old english. it is not productively formed from separable morphemes in modern english.