vt.

1. 使複雜化；使費解；使難對付
   The child's existence complicated matters considerably.

   這個小孩子的存在使問題大為複雜。

2. 併發（病）；使惡化[H]
   His disease was complicated by pneumonia.

   他的病因並發肺炎而加重。

3. 使捲入，使陷入，使牽連[H]

v.

1. make more complex or confusing.
2. Medicine  introduce complications in (an existing condition).