Who are "Merivei Ami"?
Shochar Tov (18:34): [Save me, lest] my nation judge me 1 .
Rashi: It is Do'eg, Achitofel, Sha'ul and the Zifim.
Radak #1: This is like [Merivei] Amim 2 . Also "ha'Roded Ami Tachtai" (Tehilim 144:2).
Radak #2: It is Sha'ul and those who supported him.
In Tehilim 18:44, it says Merivei Am. Shochar Tov explains, lest my nation demote me from my kingship
In Tehilim 18:44, it says Merivei Am; Malbim explained, if Ba'alei Bris [of the nations that I destroyed] will come to wage their battle, save me from them. According to Radak, the same could apply here. (PF)
What is the meaning of "Tishmereni l'Rosh Goyim"?
Rashi: You hid me for this.
Rashi citing a Midrash: Save me from the law of Yisrael - if I pervert the law, or if I subjugate him improperly, I am punished! Rather, make me head of the Pelishtim - they will serve me, and I will not be punished!
Radak: You guarded me and put Your eyes on me for the good, until I became the head of nations.
Malbim (Tehilim 18:44): (Not only will Nochrim not strike me for having destroyed their friends.) Rather, You even made me the head of nations!