arm someone against something Definition

arm²
noun

1. A weapon.

Example: nuclear arms
Example: firearm
Thesaurus: weapon, gun, instrument of war, firearmarmaments, ordnance.
2. Fighting; soldiering.
3. A heraldic design that, along with others, makes up the symbol of a family, school, country, etc.

verb armed, arming

1. To equip (with weapons).

Thesaurus: equip, outfit, furnish, supply, gird, provide, accoutre, fit out.
2. To prepare (a bomb) for use.

Idiom: bear arms

To serve as a soldier.

Idiom: lay down one's arms

To stop fighting.

Idiom: take up arms

To begin fighting.

Idiom: under arms

Armed and ready to fight.

Idiom: up in arms

Openly angry and protesting.
Thesaurus: agitated, alarmed, aroused, excited, riotous.

Etymology: 14c: from Latin arma.

Phrasal Verb: arm someone against something

To protect them from it or from its effects. See also armed.

Phrasal Verb: arm someone with something

To supply them with it as protection against or preparation for something.
Example: He armed her with some inside knowledge