pop-eyed

The compound adjective "pop-eyed" is a vivid example of colloquial English word formation from the late 19th century. Its first element, "pop," is an onomatopoeic word imitating a short, sharp sound, which figuratively conveys the sense of something happening suddenly or bursting forth. When combined with the adjective-forming suffix "-ed" attached to "eye," it creates the literal image of eyes that seem to have "popped" out due to a strong reaction. Thus, the word logically progresses from the literal concept of a sudden bursting sound or motion to the metaphorical description of eyes widened in shock or naturally protuberant in appearance.

Structure: pop (sound/action) + eyed (having eyes) - pop: (Origin: Imitative, Middle English) A short, sharp, explosive sound; suggests a sudden action. - eyed: (Origin: Old English ēage (eye) + -ed (suffix forming adjectives)) Having eyes of a specified kind.