Is the phrase "bled our country dry" a metaphor? Or some other figure of speech?
bleed someone white and bleed someone dry. TFD
to take all of someone's money; to extort money from someone.
It is metaphorical, a country does not bleed. It can though be bled dry of treasure and life.
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And the metaphor "bleed dry" almost certainly derives from the practice of hanging a slaughtered animal head-down until all the blood drains out. – Hot Licks Mar 18 '19 at 17:32