The term "pierce" means to stab something with a sharp, pointed object. It is also used figuratively to refer to causing someone deep emotional pain.
* A soldier pierced Jesus' side when he was hanging on the cross.
* In Bible times, a slave who was set free would have his ear pierced as a sign that he was choosing to continue working for his master.
* Simeon spoke figuratively when he told Mary that a sword would pierce her heart, meaning that she would experience deep grief because of what would happen to her son Jesus.