The word subierais is the imperfect subjunctive form of subir in the second person plural.
See the full subir conjugation
No puedo creer que os subierais al tren. Ni yo.
I can't believe you hopped a freight. Me neither.
Podrían haber esperado a que subierais.
They could have waited till you all got up there.
Su padre intenta hacer algo bonito, Así que me gustaría que dejarais de quejaros, y se subierais al coche.
Yourather is trying to do something nice, So I would appreciate it if you would stop your whining And just get in the car.
Así que me gustaría que dejarais de quejaros, y se subierais al coche.
So I would appreciate if you would stop your whining and just get in the car.
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