Psalms 18:47

It is God that avengeth me - Margin, giveth avengements for me. The marginal reading is a literal translation of the Hebrew. The meaning is, that God had punished the enemies of the author of the psalm for all the wrongs which they had done to him. Compare Romans 12:19.

And subdueth the people under me - Margin, destroyeth. The idea is that he had subdued the nations so that they became obedient to him. The primary notion of the word used here - from דבר dâbar - is to set in a row; to range in order; to connect; to lead; to guide; - then, to reduce to order; to subdue. This God had done in respect to the nations. Instead of being rebellious and tumultuous, God had reduced them to obedience, and had thus set him over a kingdom where all were subject to order and to law.