n.

1. 断枝；剪枝
2. 缺牙；暴牙
3. 暗桩
4. 意料不到的障碍；潜在的困难
   We encountered a snag in the implementation of this project.

   在实施这个方案时我们遇见了一个潜在的困难。

vt.

1. 加以阻挠
2. 搁浅
3. 清除（江、河等）的暗桩

n.

1. an unexpected or hidden obstacle or drawback.
2. a sharp or jagged projection.
3. a small rent or tear.
4. N. Amer. a dead tree.

v.

1. catch or tear on a snag.
2. N. Amer. informal catch; obtain.

n.