throw the baby out with the bathwater

Etymology
From a proverb that dates to 1512. First recorded by Thomas Murner in his satire Narrenbeschwörung. First appeared in English when Thomas Carlyle translated it and used it in an 1849 essay on slavery.

Verb

 * 1)  To discard, especially inadvertently, something valuable while in the process of removing or rejecting something unwanted.
 * They cancelled the entire project because the new management didn't like the prototype, but I think they threw the baby out with the bathwater.

Translations

 * Czech: vylít vaničku i s dítětem
 * Danish: kaste barnet ud med badevandet, smide barnet ud med badevandet
 * Dutch:
 * Finnish: heittää lapsi pois pesuveden mukana, heittää lapsi pesuveden mukana
 * French:
 * German:
 * Hebrew:
 * Hungarian:
 * Icelandic: að kasta barninu út með baðvatninu
 * Irish: an t-asal a dhíol leis an adhastar
 * Italian: buttare il bambino con l'acqua sporca
 * Japanese: 角を貯めて牛を殺す
 * Norwegian:
 * Bokmål: helle barnet ut med badevannet, kaste barnet ut med badevannet, slå barnet ut med badevannet
 * Nynorsk: slå ut barnet med badevatnet
 * Polish: wylewać dziecko z kąpielą,
 * Portuguese: deitar fora a criança com a água do banho, jogar fora o bebê com a água do banho
 * Russian: вме́сте с водо́й вы́плеснуть и ребёнка, вы́плеснуть ребёнка вме́сте с водо́й
 * Swedish: kasta ut barnet med badvattnet