A law is a set pattern of how things happen; it is a rule. The law of gravity deems that a heavy slab of concrete will remain where it is placed. Thus sidewalks stay in place. But we all have seen a sidewalk that is heaved up and twisted because once a small acorn fell between the slabs of the sidewalk and now has grown into a massive oak tree whose roots are powerful enough to move great weights.
That is what is meant by the triumph of one law over another—such as the law of life over the law of sin and death.
Baker Books, 1500 Illustrations for Biblical Preaching, by Michael P. Green