jogar fora o bebê com a água do banho angolul

throw the baby out with the bathwater▼((idiomatic) to discard something valuable)
verb
[UK: ˈθrəʊ ðə ˈbeɪ.bi ˈaʊt wɪð ðə ˈbɑː.θwɔː.tə(r)] [US: ˈθroʊ ðə ˈbeɪ.bi ˈaʊt wɪθ ðə ˈbɑː.θwɔːr.tər]