Hi Napoleonponapa, The expression "hold (down) the fort" may have military roots, but I have no idea whether it is actually still used in a military context -- other than with the modern, idiomatic meaning. The expression "hold (down) the fort" is used very generally to mean " to be left in charge of a situation or place while someone is away " or " to take care of things or a place while someone is away ". For example, imagine that Sam and Mary are in charge of a stand at a trade fair.
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