clap-trap

In early 18th-century London theater, a clap-trap was literally a device for trapping claps—a showy line, a patriotic speech, a sentimental aside inserted into a play for no reason except to provoke applause. The dramatist and critic John Dennis complained about them in 1711. The word appeared in print by 1727, already contemptuous.

The Drury Lane and Covent Garden theaters of Georgian London were noisy, competitive places. Audiences expected entertainment, and playwrights who couldn't earn genuine admiration settled for mechanical applause. A well-placed reference to British valor, a tearful speech about orphans, a flag unfurled at the right moment—these were clap-traps, and everyone in the business knew it.

By the 1800s, the word had detached from theater entirely. Claptrap meant any language designed to impress without substance—political rhetoric, sales patter, empty oratory. The theatrical origin was forgotten; the contempt was not. Thomas Carlyle used it in 1843 to describe hollow parliamentary speeches.

The hyphen disappeared. Claptrap became one word, one concept: language that sounds impressive and means nothing. The word is its own best critic—it names the trick and judges it in the same breath.