13 The Hiphil of ידה normally means “give thanks, praise,” but here, as in Prov 28:13, it means “confess.”
14 Heb “the wrongdoing of my sin.” By joining synonyms for “sin” in this way, the psalmist may be emphasizing the degree of his wrongdoing.

In other versions

I acknowledged my sin to you,

and I did not cover my iniquity;

I said, “I will confess my transgressions to the Lord,”

and you forgave the iniquity of my sin. Selah

Then I acknowledged my sin to you

and did not cover up my iniquity.

I said, “I will confess

my transgressions to the Lord.”

And you forgave

the guilt of my sin.

Then I acknowledged my sin to you

and did not conceal my iniquity.

I said, “I will confess my transgressions to the Lord,”

and you forgave the guilt of my sin.

Selah

Finally, I confessed all my sins to you

and stopped trying to hide my guilt.

I said to myself, “I will confess my rebellion to the Lord.”

And you forgave me! All my guilt is gone.

Interlude

I made known my sin to you, and my iniquity I did not cover.

I said, “I will confess concerning my transgressions to Yahweh,”

and you took away the guilt of my sin. Selah

I acknowledged my sin unto thee,

And mine iniquity have I not hid.

I said, I will confess my transgressions unto the Lord;

And thou forgavest the iniquity of my sin. Selah.

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