English Reference
Idiom idiom

caveat emptor

C1 Formal Roman origin
Meaning

Let the buyer beware — checking what you are buying is your own problem.

Examples
SIMPLE

“It's sold as seen — caveat emptor.”

CONTEXTUAL

“At an auction of unexamined lots the only rule that really applies is caveat emptor.”

COMPLEX

“The marketplace's terms disclaimed responsibility for every listing on it, which reduced a platform handling millions of transactions to a caveat emptor arrangement of the kind the law spent a century dismantling.”

Origin

The Latin is Roman; the rule is not. Roman law leaned the other way. The aediles who policed the markets issued an edict requiring sellers of slaves and cattle to declare defects, and a buyer who found an undeclared one could return the goods and get the money back. That is closer to modern consumer protection than to caveat emptor.

Caveat emptor — let the buyer beware — was formulated by English common lawyers in the sixteenth century, in Latin because that is what lawyers wrote in, and it hardened into the default rule of English sale: inspect it yourself, because the seller owes you nothing but honesty about what he actually said.

Statute has been eating away at it for over a century, and in consumer sales it has largely gone. The phrase survives in English as a general warning, usually attached to anything sold privately, cheaply, or at speed.

The Law's Latinconnected storiesSee all Roman origin →

Roman legal Latin that never left the courtroom — or the boardroom.

  1. 01

    bona fide (idiom)

    Genuine and honestly meant — the real thing, not a pretence.

    The Roman standard of good faith.
  2. 02

    quid pro quo (idiom)

    Something given in return for something else, usually as an understood trade.

    From the apothecary's substitute.
  3. 03

    de facto (idiom)

    In practice, whatever the official position says.

    The question of fact.
  4. 04

    de jure (idiom)

    According to the law, whether or not that is what actually happens.

    The question of law.
  5. 05

    ipso facto (idiom)

    By that very fact — the consequence follows automatically, with no further step.

    Consequences that need no hearing.
  6. 06

    the status quo (idiom)

    The way things currently are, especially when someone wants to keep them that way.

    In statu quo ante bellum.

Last updated August 3, 2026