let the cat out of the bag

Etymology
(Mid-1700s) The inverse of the idiom pig in a poke. If a dishonest merchant tries to sell a cat as a pig and the cat comes out or is taken out of the bag, the merchant's secret is disclosed.

Verb

 * 1)  To disclose a secret; to let a secret be known, often inadvertently.

Synonyms

 * ,, , , , babble, sing

Translations

 * Afrikaans:, die kat uit die sak laat
 * Breton:
 * Czech: prořeknout se, vybreptat to
 * Danish: slippe katten ud af sækken
 * Finnish: möläyttää julki
 * French:
 * Galician: irse da lingua
 * German:
 * Hebrew:
 * Hungarian:, , eljár a szája, elszólja magát, ,
 * Icelandic: tala af sér, leysa frá skjóðunni
 * Italian:
 * Luxembourgish: d'Kaz aus dem Sak loossen
 * Mandarin:
 * Norwegian: slippe katta ut av sekken
 * Polish: wypuścić kota z worka
 * Portuguese:
 * Russian: вы́нести сор из избы
 * Scottish Gaelic: leig mu sgaoil e
 * Spanish:, levantar la liebre, descubrirse el pastel, destapar la olla