What is "Dibas Rabim"?
Rashi: It is the counsel of many people. Dibas is like "Dovev Sifsei Yeshenim" (Shir ha'Shirim 7:10). The same applies to every Dibah in Tanach.
Radak: Enemies used to slander him to Sha'ul.
Malbim: [My close ones forgot me, but] my afflicters did not forget me. I heard their plotting against me, to hand me over to Sha'ul. Amidst this, they slandered many, e.g. they said that Nov, Ir ha'Kohanim are supporting me.
What is the meaning of "Magur mi'Saviv"?
Rashi: They threaten and scare me.
Radak: My fear is not from one corner, that I can guard from it. It is from all around!
Malbim: Everyone around me fears lest the king punish them [like he killed Nov, Ir ha'Kohanim].
What is "b'Hivasdam"?
Rashi: It is their counsel.
Why does it say "Lakachas Nafshi"?
Radak: They do not intend to take me for a slave, rather, to kill me!
Malbim: [Since all fear lest the king punish them,] they plot to kill me; everyone tells Sha'ul where I am.