What does flash mean?
Flash refers to a sudden, brief burst of light or energy — a camera flash, a lightning flash, a flash of headlights on a dark road. It also names anything strikingly short-lived: a flash of anger, inspiration, or memory, or a moment that passes 'in a flash.' As a verb, it means to shine, appear, or move swiftly and briefly, whether a signal lamp flashing at sea or headlights flashing a warning. Figuratively, flash suggests brilliance without staying power: a 'flash in the pan' is a burst of promise that fizzles out. In informal British usage, 'flash' even describes showy, ostentatious style. Its versatility across literal light, fleeting time, and quick movement makes it one of English's most vividly kinetic words.
A sudden brief burst of light or energy, or figuratively, a very short instant of time.
"A flash of lightning illuminated the entire valley."
Often used with prepositions like 'of' (a flash of hope) or 'in' (gone in a flash).
To emit or reflect light suddenly and briefly; to move or appear very quickly; or to display something briefly.
"Her eyes flashed with anger during the argument."
Standard plural used when counting multiple bursts or instances, such as several flashes of lightning.
"We counted three distinct flashes before the power went out."
The word 'flash' is so old that its true origin remains a mystery — linguists still can't pin down where it came from.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of flash
The word 'flash' is first recorded in English around the late 16th century, appearing in Shakespeare's era. Its precise origin is uncertain; scholars have suggested links to words meaning to splash or gush, possibly related to Old French terms for liquid movement. Despite extensive study, no definitive root has been confirmed, making 'flash' one of those everyday English words whose deep history remains genuinely obscure.
Related word forms
How flash is actually used
Commonly used informally. The verb sense 'to flash' can carry a mildly negative connotation when referring to showing off wealth or possessions ('flashing his new watch'). In British English, 'flash' as an adjective describes someone showily ostentatious.
Easily confused with flash
Flesh refers to the soft substance of the body, while flash refers to a sudden burst of light or a quick display.