ally Meaning in the Cambridge English Dictionary
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Meaning of “ally” in the English Dictionary

"ally" in British English

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allynoun [C]

uk   us   /ˈæl.aɪ/
C2 a ​country that has ​agreedofficially to give ​help and ​support to another one, ​especially during a ​war: The US is one of Britain's staunchest allies. During the First World War, ​Turkey and Germany were allies/​Turkey was an ally of Germany.
See also
C1 someone who ​helps and ​supports someone ​else: He is ​generallyconsidered to be the ​prime minister's closestpolitical ally.
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(Definition of ally from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ally" in American English

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allynoun [C]

 us   /ˈæl·ɑɪ, əˈlɑɪ/
politics & government a ​country that has ​agreed to give ​help and ​support to another, esp. during a ​war, or a ​person who ​helps and ​supports someone ​else
ally
verb [T always + adv/prep]  us   /əˈlɑɪ, ˈæl·ɑɪ/
I ​refused to ally myself with that ​mob.
(Definition of ally from the Cambridge Academic Content Dictionary © Cambridge University Press)
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