blinker

The word 'blinker' is a transparent English compound formed from the verb 'blink' and the agentive suffix '-er'. The verb 'blink' itself originates from Middle English, likely imitative of the quick, gleam-like motion of closing and opening the eyes. By the late 16th century, 'blinker' emerged to describe a device that limits vision, akin to a horse's blinders, based on the notion of causing someone to blink or see only intermittently. The modern automotive sense, referring to a flashing directional light, is a 20th-century semantic extension, where the light itself performs the action of 'blinking' on and off to signal intention.

Structure: blink (to shine intermittently) + er (agent/instrument suffix) blink: Middle English, of imitative origin (onomatopoeic for a quick gleam or movement of the eyelids). Its functional role is the core action of flashing or shining intermittently. er: A native English suffix forming agent nouns from verbs, indicating a person or thing that performs the action. Its functional role is to form an instrument that performs the act of blinking.