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What has worked for me (have received no complaints) is : "After landing 737 line up and power up on the breaks.."
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Strange... the only thing I do on my breaks is power down with a cup of tea. I suppose you meant BRAKES!
But seriously, we all know how important it is not to lose your place in the queue at the holding point, so I am sure there have been occasions when you have taxied into position on the threshold as you are still finishing the final checks. If you do this, the last thing the Tower controller wants to hear when he clears you for takeoff with one at 2 miles is "We're not QUITE ready". Hence the pointer that you had better move those throttles smartly when cleared unless you want a close look at the underside of one going around above you.
The result of an aircraft slow to roll with an arrival over the hedge was rather frighteningly displayed at Heathrow a while back with a BA 747 and a Midland (then) 737
At least the instruction you question lets you know exactly what is expected of you.