English example sentences with "up against it"

I know you're up against it.
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A state that entrusts its protection to mercenaries will sooner or later perish, as did ancient Rome, whose inhabitants only wanted to eat and entertain themselves, and left the protection of their native land to the Germanic tribes. The latter betrayed their employers as soon as it became profitable. A real, strong enemy retreats only when all the inhabitants of the country are ready to stand up against it.
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There was a car with a girl leaning up against it.
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