a baseball pitcher who throws the ball with the left hand
a person who uses the left hand with greater skill than the right
"their pitcher was a southpaw"
One who is left-handed, especially in sports.
The term "southpaw" combines "south" and "paw," originally referring to a left-handed pitcher whose arm faced south when standing on an east-facing mound in 19th-century ballparks designed to avoid the afternoon sun. While this baseball usage became common by 1813, earlier slang from the 1840s may have applied the word to a left-handed punch in boxing.