a person who uses the left hand with greater skill than the right
"their pitcher was a southpaw"
a baseball pitcher who throws the ball with the left hand
"The home crowd cheered wildly as their favorite lefty struck out three batters in a row."
One who is left-handed.
"The pitcher proudly showed off his glove to prove he was a true lefty."
Left-handed.
"The lefty struggled to reach the top shelf, so he switched his stance and grabbed a step stool instead."