was blacking
Past progressive conjugation of black. There are other translations for this conjugation.

black

By the time Danielle arrived at the Memorial Hospital Pembroke ER, her heart was hammering at a very dangerous 270 beats per minute–and she was blacking out.
Cuando Danielle llegó a la sala de emergencias del Memorial Hospital Pembroke, su corazón latía peligrosamente a 270 pulsaciones por minuto y estaba perdiendo el conocimiento.
Outside the bar, a shoe shiner was blacking a man's shoes.
En la puerta del bar, un limpiabotas le lustraba los zapatos a un señor.
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