an uncastrated male sheep

a battering ram

the weight that strikes the blow in a pile driver

the plunger of a press driven by the pressure exerted by a liquid or a force pump that draws or forces liquid through valves

(the Ram) the constellation and sign of the zodiac Aries

to force (something) down or in by driving, pressing, or pushing it

He rammed his hat down over his ears

to force the passage or acceptance of (something)

The message had been rammed home

to strike against (something) violently and usu head-on

to make (e.g. earth) firm and compact by pounding

to come into violent contact with something

Her car rammed into a tree