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Definition of Lock and load
1. Verb. (American English) A slang military command to prepare weapons for battle. No US weapon includes "lock and load" as one of the commands related to that weapon, nor is it a recognized range command. However the command used on the firing range at Fort Jackson (US Army) in 1970 was "Lock and Load one round, live ammunition." ¹
2. Verb. (slang) To prepare for an imminent event. ¹
¹ Source: wiktionary.com