פירוש על ברכות 68:31

[WHOSE] TRANSGRESSION IS COVERED OVER. The Psalmist praises one who covers his sins, i.e. he does not tell others that he has sinned. Why is this especially praiseworthy? And the reason that this is praiseworthy is because that when a person does not tell others that he has sinned it shows that he is ashamed that he sinned. However, if one tells others that he has sinned it appears that he is not ashamed about his sin, and we have said earlier in the first perek (12b) whosoever does something, a sin, and is embarrassed because of the sin, he is forgiven immediately. Being embarrassed about the sin which brings about forgiveness is therefore praiseworthy.

Openly, as though not ashamed of them.

Lit. covered, i.e. not exposed.