How would you explain ‘buck up’ in the context? Lucky Lindy’s baby is kidnapped, and everyone is afraid, even boys locked up in a brick school. For the hero who flew across the ocean, a terrible crash. The newspapers say any child is in danger if Lindbergh could be that unlucky. But this country already had bad-luck people everywhere, sleeping in the parks, wearing newspapers for coats. The people who have good cloth coats look out the trolley windows and say, Those bums need to buck up. Unlucky Lindy makes them afraid because it happened to a hero. How would you explain ‘buck up’ in the context? PS: the story took place in 1932. Thanks!