If a sharp object pierces something, or if you pierce something with a sharp object, the object goes into it and makes a hole in it.
双语例句
例：
One bullet pierced the left side of his chest.
一颗子弹射入了他的左胸。
2.?[T 及物动词] 穿孔
If you have your ears or some other part of your body pierced, you have a small hole made through them so that you can wear a piece of jewellery in them.