tirar piedras contra el propio tejado

Spanish

Etymology

Literally, "throw stones against one's own roof"

Verb

tirar piedras contra el propio tejado (first-person singular present tiro piedras contra el propio tejado, first-person singular preterite tiré piedras contra el propio tejado, past participle tirado piedras contra el propio tejado)

1. (idiomatic) to foul your own nest, to shoot oneself in the foot
2. (idiomatic) to cut off one's nose to spite one's face