ram
US /ræm/
UK /ræm/

1.
an uncastrated male sheep
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The shepherd led the flock, with a large ram at its head.
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The ram had impressive curled horns.
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2.
a device for forcing things together or for exerting pressure
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The hydraulic ram was used to lift the heavy machinery.
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A battering ram was used to break down the castle gate.