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English definition of “ally”

ally

noun [C]  /ˈæl·ɑɪ, əˈlɑɪ/ us  
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]  /əˈlɑɪ, ˈæl·ɑɪ/ us  
I refused to ally myself with that mob.
(Definition of ally from the Cambridge Academic Content Dictionary © Cambridge University Press)
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