The word originates from the Old English root fyrhtu , meaning "fear, dread, trembling, or a horrible sight".

: Despite their similar meanings, "frighten" and "fear" are not etymologically related. "Fear" generally refers to a more persistent state, while "fright" specifically denotes a sudden alarm. 2. Psychological Mechanics

: Interestingly, "fright" was originally used as both a noun and a verb. The modern verb form frighten (fright + -en suffix) emerged in the mid-1600s, with one of its earliest recorded uses appearing in the diary of Samuel Pepys in 1666.

Being frightened triggers a primal survival mechanism known as the .