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To eliminate the border at the bottom of the Flutter TabBar, you can set the TabBar's border property to Border(bottom: BorderSide.none) like this:

TabBar(
  tabs: [
    Tab(text: 'Tab 1'),
    Tab(text: 'Tab 2'),
  ],
  border: Border(bottom: BorderSide.none),
),

This sets the bottom border to none, effectively removing it.