Related Clues:

• Windows button
• Go ahead
• Zero hour, e.g.
• Get the show on the road
• Square one
• Decisive moment
• 6-6-44
• A shot might indicate it
• Proctor’s instruction
• Time for decisive action
• Git-go
• June 6th of 1944
• Where to begin
• First stage
• See 87 Across