Lock-and-load meaning

(US, slang) A command to prepare a weapon for battle.
interjection
12
0
(US, slang) Prepare for an imminent event.
interjection
4
1
Advertisement

Origin of lock-and-load

Originated in American English, supposedly as an instructional command to prepare an M1 Garand, the main rifle used during World War II, for battle. the expression was popularized 1949 by John Wayne in the movie Sands of Iwo Jima. Various similar phrases predate it, including in transposed form as “load and lock”. It is disputed whether the command "lock and load" was ever used by the US military in WWII. The term, "lock and load" was used in the US Army as late as 1969 and was also used in Vietnam.