(pl. -ies)
1- a state formally cooperating with another for a military or other purpose, typically by treaty（尤指通过条约以军事等为目的的）结盟。
1.1
- a person or organization that cooperates with or helps another in a particular activity同盟者, 同盟：
he was forced to dismiss his closest political ally.
他被迫解散他最亲密的政治同盟。
1.2
the Allies
a group of nations taking military action together, in particular the countries that fought with Britain in the First and Second World Wars协约国, 同盟国。
(亦作/əˈlaɪ)(-ies, -ied)
1- with obj.
ally something to/with
combine or unite a resource or commodity with (another) for mutual benefit与…结盟, 结合, 联合： he allied his racing experience with his father's business acumen.
他将自己的竞技经验和其父的商业精明结合起来。
1.1
ally oneself with
side with or support (someone or something)拥护, 支持（某人, 某物）：he allied himself with the forces of change.
他支持变化的力量。
词源
Middle English (as a verb)： from Old French alier, from Latin alligare 'bind together'， from ad- 'to' + ligare 'to bind'; the noun is partly via Old French alie 'allied'. Compare with ALLOY.