Definition of "keep it up" []

• To maintain or continue a positive streak. (verb)
• To maintain one's erection. (verb)

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• "Why not just keep it up until you own enough real estate to help you shelter the income from your free-and-clear properties?"
• "A pair that could pull a heavy T-cart with four people eight or nine miles an hour and keep it up without urging, were fast enough in my opinion."
• "And people began to say there was surely something between the god and me; for how could I keep it up against men so much bigger, unless Earth-Shaker put out a hand to pull them to the ground?"