Dubai gears up for National Day.could anyone tells me the meaning of gears up for above sentence.Thanks!
gears up = "gets going" OR "prepares for" (preparational chores and activities in advance of an impending event)

as in shifting into a higher gear in your car.
for a faster speed.
to get things GOING.

on an emotional level "gears up" can mean "growing excitment".

Dubai prepares for National Day.
Dubai grows excited for the coming National Day.

I just looked it up for you:

gear up

To get ready for a coming action or event: a group of investors who had geared up for the takeover fight.
[Middle English gere, equipment, from Old Norse gervi; akin to gera, to do, make, make ready.]

The American Heritage® Dictionary of the English Language, Third Edition copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from InfoSoft International, Inc. All rights reserved.