Britain : to relax in formation : stand at ease — often used in commands to troops to give them a rest interval
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stand easy (military)
A command to stand in a still more relaxed position
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Main Entry: ↑easy
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ˌstand ˈeasy idiom
used as a command to soldiers who are already standing ↑at ease to tell them that they can stand in an even more relaxed way
Useful english dictionary. 2012.