A four-base hit; a home run
The first baseman hit a homer to lead off the ninth.
A homing pigeon
Each of the pigeon fanciers released a homer at the same time.
A person who is extremely devoted to his favorite team.
Joe is such a homer that he would never boo the Hometown Hobos, even if they are in last place in the league.
To hit a homer; to hit a home run.
The Sultan of Swat homered 714 times.