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| Date: | 1200-1300 |
| Language: | Old French |
| Origin: | armer, from Latin armare, from arma; ARM1 |
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arm2 [transitive]
1 to provide weapons for yourself, an army, a country etc in order to prepare for a fight or a war
arm somebody with something 
The local farmers have armed themselves with rifles and pistols.The rebels armed a group of 2000 men to attack the city.
➔ armed, unarmed
The local farmers have armed themselves with rifles and pistols.The rebels armed a group of 2000 men to attack the city.2 to provide all the information, skills, or equipment you need to do something [= equip]
arm somebody with something Arm yourself with all the facts you need to argue your case. The guidebook arms the reader with a mass of useful information.
Arm yourself with all the facts you need to argue your case.The guidebook arms the reader with a mass of useful information.