Related Clues:

• Cancel a launch
• A bridge in Trim that is not high enough
• Liftoff-canceling command
• "Cancel the mission!"
• Cancel suddenly
• Call off a mission
• Cancel before the end of the countdown
• Terminate before completion
• Command sometimes given if something is about to fail
• Call off (a mission)
• Terminate, as a launch
• Stop before launch
• Intercept copper, upper-class chap
• Brought to an abrupt conclusion
• Scrub, as a rocket launch