This idiom means that Yahweh will enable David to have victory over them. AT: "give you victory over them" (See: [[rc://en/ta/man/translate/figs-idiom]])
David speaks of God easily defeating David's enemies as if God had burst through them, like a flood bursts through anything in its path. AT: "God has easily defeated my enemies ... like a flood easily bursts through everything" (See: [[rc://en/ta/man/translate/figs-simile]])