-they would whisper
The word susurrarían is the conditional form of susurrar in the third person plural.
See the full susurrar conjugation


Les escuchó hablar de ello; creían que sus últimos pensamientos se quedaban ahí. Quizás, si esperaba lo suficiente, susurrarían en su oído, y ella conocería los débiles pensamientos de alguien a punto de caer en el olvidado.
She overheard them talking about it; they believed that his final thoughts would linger there. Perhaps, if she waited long enough, they would whisper in her ear, and she would know the fading thoughts of one on the cusp of oblivion.
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