1. To be one of two opposite directions, sides or positions. If you are facing north, where the sun sets is in this relative position (in the west); facing south, sunrise is in this position (in the east). English = (be) left.
2. To be on one of two opposite sides of the body; namely, the side of the body which is opposite the side with the hand that most people write, sign or do complicated things with. English = (be) left.