רִֽ֭יבְךָ רִ֣יב אֶת־רֵעֶ֑ךָ וְס֖וֹד אַחֵ֣ר אַל־תְּגָֽל׃
Kung makikipagtalo ka, ipaglaban mo ang iyong usapin sa iyong kapwa, ngunit huwag mong ibunyag ang lihim ng iba;
Ibn Ezra
a shameful perversion [Hebrew: ḥesed] from “lest the hearer put you to shame” [Proverbs 25:10]. The word denotes an egregious sexual crime.
Rashi
And do not conceal Heb. וְאַל תְּכַס, like וְאַל תְּכַסֶה, similar to (Prov. 25:9): “...but do not divulge (תְּגָל) another’s secret,” like תְּגַלֶה.