ETYM as. ramm, ram; akin to Old High Germ. and Dutch ram, Prov. German ramm, and perh. to Icel. ramr strong.
A tool for driving or forcing something by impact.
Any of various guided pieces for exerting pressure or for driving or forcing something by impact: as the plunger of a hydrostatic press or force pump; the weight that strikes the blow in a pile driver.