What does startle mean?
To startle is to surprise or alarm someone suddenly, often strongly enough to interrupt what they are doing. The word can be used transitively, as in “the news startled her,” or intransitively, as in “he startled at the sound.” It describes an immediate reaction rather than a prolonged state of fear: a person may be startled for a moment and then recover. Startle is especially associated with unexpected sights, sounds, movements, or revelations, such as an animal appearing unexpectedly or someone being confronted with surprising news. The related adjective “startling” emphasizes the surprising quality of the event itself, while “startled” usually describes the affected person’s reaction. In everyday use, the word conveys abruptness and momentary alarm without necessarily implying serious distress.
To cause someone to feel sudden shock, surprise, or alarm.
"The sudden knock startled the child."
Common in both British and American English.
To become suddenly surprised or alarmed.
"The audience startled at the unexpected sound."
Often used with “at,” as in “startle at a noise,” though this pattern is less common in modern formal usage.
A startle is the brain's instant alarm bell: one unexpected sight can interrupt a whole train of thought.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does startle come from?
The verb developed in Middle English from “start” together with the suffix “-le,” originally suggesting a sudden movement or abrupt change. Its modern sense of causing sudden surprise or alarm developed from earlier meanings connected with sudden movement. The word is related to “start” and “startling,” while “start” itself has roots in Old English and Old Norse traditions associated with beginning or setting in motion.
Related word forms
How startle is actually used
Startle is generally neutral to slightly dramatic and is common in both formal and informal English. It usually describes a sudden reaction to an unexpected event, sound, sight, or action.
Easily confused with startle
To start an activity is to begin it, while to startle someone is to shock or surprise them suddenly.
To startle means to cause sudden surprise or alarm, whereas to stun can mean to render someone unconscious, dazed, or unable to act.