Literally. Once you've lifted it, drop it ... if you can. If you have bumper plates just drop it. If you don't, lower as quickly as you can. I'm talking fraction of a second. And don't guide it on the way down. As Chad Waterbury reminds, NOTHING good comes out of the negative portion of the barbell deadlift.
The deadlift is a notable exception to the rule "Concentric as fast as possible, eccentric under control." The reverse is the case. Lift deliberately, lower as fast as possible.
With this in mind I'm just doing singles now. Here's what my workout looked like today:
135 X 1
155 X 1
175 X 1
195 X 1
215 X 1
235 X 1
215 X 1
215 X 1
215 X 1
215 X 1
Notice how I worked up to a max (not my true max, I back-cycled recently) then dropped a bit in order to adhere to my 10-Rep Rule.
Just take this under consideration. You may have cause to thank me.