ally

vt.

1. 使结盟；使联姻[（+with/to）]
   The small country allied itself to/with the stronger power.

   小国和强国联盟。

2. （在起源或性质上）与……相关联[H][（+to）]
   The English language is allied to the German language.

   英文和德文属同一语系。

vi.

1. 结盟；联合[（+with/against）]
   The three sisters allied against their elder brother.

   三姊妹联合起来反对哥哥。