נִדְב֣וֹת פִּ֭י רְצֵה־נָ֣א יְהוָ֑ה וּֽמִשְׁפָּטֶ֥יךָ לַמְּדֵֽנִי׃
Accept, I beseech Thee, the freewill-offerings of my mouth, O LORD, And teach me Thine ordinances.
Rashi on Psalms
The freewill offering of my mouth Words of appeasement that my mouth offers You. Every נדבה, is an expression of appeasement.