Ready to proceed or depart; all preparations are complete and approval has been given.
This phrase gained prominence in military and aviation contexts during the latter half of the 20th century, used to confirm that personnel, equipment, or missions were ready for execution. It combines readiness with authorization to proceed.
The phrase's military origins emphasize both capability and permission - being 'good to go' means you're not just ready, but you've received clearance from authority. It's become the casual equivalent of 'mission approved.'
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