peeper
UK[ˈpiːpə]US[ˈpiːpər]
n
A person who peeps or looks quickly, especially in a secretive or furtive manner.
n
An animal, such as a frog, that makes a peeping or chirping sound.
n
(informal, often in plural) An eye.
Morpheme Breakdown
peep
er
peep
to look quickly or make a short, high sound
er
agent suffix
Etymology
The word 'peeper' is a straightforward English formation, combining the imitative verb 'peep' with the agentive suffix '-er'. The verb 'peep' itself is onomatopoeic, originating in Middle English to mimic the short, weak cry of a bird or chick, a sense which naturally extended to describe a brief, high-pitched sound. From this auditory meaning, the verb developed the visual sense of "looking quickly or furtively," akin to a brief, darting glance. Consequently, an '-er' agent noun formed from 'peep' logically yields a term for one who looks secretly, an animal that makes a peeping sound, or, informally and humorously, the eye as the organ of peeping.
Analysis
Structure: peep (to look quickly or make a short, high sound) + er (agent suffix)
'Peep' is of imitative origin, likely from Middle English 'pepen', representing a short, high sound. The suffix '-er' is from Old English '-ere', an agent noun suffix indicating "one who does" or "a thing associated with".
Examples
The photographer was accused of being a peeper, hiding in the bushes to capture candid shots.
In early spring, the marsh comes alive with the chorus of tiny peepers.
He was so tired that dark circles formed under his peepers.