were strobing
Past progressive conjugation of strobe. There are other translations for this conjugation.

strobe

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500+ learners.
The music was getting louder, and the lights were strobing faster and faster driving the crowd to fever pitch.
La música cada vez estaba más alta, y las luces se encendía y se apagaban cada vez más rápido, llevando a la multitud a un estado febril.
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