what dose doubling down mean?

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So in the book it states the following

Any player may choise to double down on an opening hand of 9 10 or 11. on that players turn. they may make another equal bet to there original one. doubling it. That player is dealt one card only, face down, to be revealed after the dealers turn

So dose that mean that if there first two card total 9, 10 or 11 then they can choise to double down?
Then they double there bet,

But what happens at then end of the bet if the player losses by numbers as usuall to the banker. do they loose bough there bets?
What if the players (3 card) score is higher then the deals? then what? what dose the player win?

Thanks
 
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