The word embarrasteis is the preterite form of embarrar in the second person plural.
See the full embarrar conjugation

embarrar

No creáis que vuestro sufrimiento es demasiado, al contrario, a través de él lavad vuestra túnica en el ácido del sufrimiento, pues solamente así saldrá el duro cemento en el que embarrasteis vuestra almas.
Do not judge too much your pain; on the contrary, through them wash your tunic in the acid of suffering, because, only then, will be removed the hard cement that covered with mud your souls.
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