oscurecerías
-you would darken
The word oscurecerías is the conditional form of oscurecer in the second person singular. There are other translations for this conjugation.
See the full oscurecer conjugation

oscurecer

No tenía idea que oscurecerías mi entrada.
I had no idea you'd be darkening my doorway.
No pensé que oscurecerías mi umbral otra vez.
I didn't think you'd darken my doorstep again.
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