Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: armer, from Latin armare, from arma; ARM1

arm

2 verb
     
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
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.

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