ally

US /ˈæl.aɪ/
UK /ˈæl.aɪ/
"ally" picture
1.

a state formally cooperating with another for a military or other purpose

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During the war, several nations formed an ally against the common enemy.
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The United States has long been a strong ally of many European countries.
:
confederateassociatepartnercollaboratorfriend
2.

a person or group that provides assistance and support in an ongoing effort or struggle

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She found a strong ally in her fight for social justice.
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He became an important ally for the environmental movement.
:
supporteradvocatebackerhelperfriend
1.

to combine or unite with another for a common purpose

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The two companies decided to ally to develop a new product.
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He tried to ally himself with the most powerful faction.
:
unitejoincombinemergeassociate
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allied