In war, allies are friends — specifically, friendly nations — you can trust. Allies are on your side.

The main meaning of this word comes from war. Without allies, a country is going to be all alone in a war. Like many other words of war, this term spread beyond the battlefield. A politician trying to pass a law is going to need allies, probably in both political parties. Any time there's a disagreement or conflict, it helps to have allies: if you don't, you're all alone.

Definitions of allies
  1. noun
    an alliance of nations joining together to fight a common enemy
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    type of:
    alignment, alinement, alliance, coalition
    an organization of people (or countries) involved in a pact or treaty
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