A left-handed writer who, instead of mirroring right-handed writers, turn his or her hand upsidedown in order to put the writing implement in the same position as right-handed writers
a left-handed pitcher The term comes from the common practice of arranging fields so that home plate is west of the pitcher's mound so that the sun won't be in the batters' eyes as it sets, which orients the pitcher so his left arm is on his south side
a person who uses the left hand with greater skill than the right; "their pitcher was a southpaw"