To acknowledge faith in; to profess belief in.
To hear or receive such a confession of sins from.
To unburden (oneself) of sins to God or a priest, in order to receive absolution.
To disclose or reveal.
To admit to the truth, particularly in the context of sins or crimes committed.
To take (someone) into one's confidence, to speak in secret with. ( + in)
To say (something) in confidence.