|Origin:||armer, from Latin armare, from arma; ARM1|
to provide weapons for yourself, an army, a country etc in order to prepare for a fight or a war
arm somebody with something➔ armed, unarmed
The local farmers have armed themselves with rifles and pistols.
The rebels armed a group of 2000 men to attack the city.
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.