Why does it say "Mo'av Sir Rachtzi"?
Refer to 108:9:1:1.
Rashi (here and 60:10): It is my slave and servant, like a Kli that one uses. I will use Mo'av like a copper basin to wash 1 my feet. Radak (60:10) - it is not a Sir (pot) for cooking.
Malbim: A sign of slavery is taking his master's Kelim to the bathhouse, like Chazal said (Kidushin 22b).
What is the meaning of "Ashlich Na'ali"?
Rashi: I will cast my work on them; their kings will put my shoes on my feet 1 .
Rashi (60:10): I will enclose them.
Malbim (60:10): A sign of slavery is removing his master's shoe (Kidushin 22b).
What is the meaning of "Alai Peleshes Esro'a"?
Rashi: I will make a great noise to make them fear me. Rashi (60:10) - Gas and Azah are from Eretz Pelishtim; David conquered them.
Peleshes will join to me. (Based on Malbim 60:10.) 1
There, it says "Hisro'a'i". Malbim explained that it is a command - join to me! David did not force them to be slaves, just they ceased to fight with him.