hubieran chocado
-they/you had crashed
Past perfect subjunctiveellos/ellas/ustedesconjugation ofchocar.

chocar

Al levantarme, mis rodillas hicieron un sonido extraño como si los huesos hubieran chocado y los músculos se hubieran roto.
As I stood up, my knees had made a strange sound, and it had sounded as if the bones were colliding and muscles were rupturing.
Las tripulaciones de lejos y de cerca han desintegrado o desviado el curso de cuerpos celestes o de desechos espaciales hechos por el hombre que podrían haber causado serios daños si hubieran chocado con el planeta.
Crews far and near disintegrate or deflect the course of celestial bodies and manmade debris in space that could cause serious damage if they hit the planet.
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