combat

• Have the upper hand

  To be in a position of advantage, control, or superiority over someone or something.

• Last ditch effort

  A final, desperate attempt to succeed when all other options have failed and there is no more time or opportunity.

• Take up the gauntlet

  To accept a challenge or a dare.

• Knockout punch

  A powerful blow in boxing or other combat sports that immediately renders an opponent unable to continue, or figuratively, a decisive action that brings about a sudden and conclusive end to a situation.