It's a subtle difference, but the keen observer will notice that I braced my abs to start, locked my rib position in, and hinged through my hips (rather than my lower back). Once I grabbed the bar to pull my chest tall, I did so by encouraging more posterior tilt of my scapulae rather than hinging even more through my lower back.

As an aside, another fantastic cue to help maintain tension and to prevent yourself from hinging through your lower back is to think about squeezing oranges in your armpits.

Related:  Lift Big By Bracing, Not Arching

Related:  13 Ways to Improve Your Deadlift, Fast!