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Across 2. bring into effective action; utilize. 4. a machine for producing continuous power in which a wheel or rotor, typically fitted with vanes, is made to revolve by a fast-moving flow of water, steam, gas, air, or other fluid. 5. manage or exploit (an organization, activity, etc.) in a way designed to make a profit.

Down 1. To say go ahead, proceed 3. a first full-scale and usually functional form of a new type or design of a construction