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After bowling the Australians out for a paltry 268 runs, Team India openers Virender Sehwag and Gautam Gambhir are adding to the visitors agony by getting India off to a flying start.

Could you explain what "get off" means here?

Also I think here "visitors agony" refers to "Australian players' agony". Am I correct?
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getting India off = causing India to begin ('into execution or effect')

"visitors' agony" = "Australian players' agony"
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Comments  
It means to Start