To disclose or reveal.
To hear or receive such a confession of sins from.
To acknowledge faith in; to profess belief in.
To unburden (oneself) of sins to God or a priest, in order to receive absolution.
To admit to the truth, particularly in the context of sins or crimes committed.
To inadvertently reveal any secret, particularly a secret that puts one at an advantage or disadvantage.
In card playing, to accidentally reveal one's cards or hand.