arm

arm (someone against someone or something) (with something)

to equip someone with whatever is needed to fight against someone or something. They armed themselves against the enemy with guns and ammunition. The government armed the soldiers with the new guns.

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See:

a list as long as arm a shot in the arm an arm and a leg arm arm in arm armed and dangerous armed to the teeth babe in arms be armed to the teeth be up in arms bear arms busy as a beaver chance arm cost a pretty penny

cost an arm and a leg could do with one arm tied behind back get arms around give right arm greet with open arms have a good arm have calluses from patting own back hold at arm's length keep at arm's length keep at arm's length from Kings have long arms lay down arms long arm of the law pay an arm and a leg

put the arm on receive with open arms shot in the arm stretch your arm no further than your sleeve will reach strong-arm tactics take up arms the long arm of the law twist arm up in arms with one hand tied behind back with open arms would give right arm