arm up

an arm and a leg

Usually used after the verb cost, but also often charge, pay, and spend: a very high price for an item or service; an exorbitant price

arm candy

An attractive, seemingly romantic companion who accompanies a person in public solely so that one or both of the individuals can gain attention, enhance social status, or create an impression of sexual appeal.

arm to the teeth

To equip thoroughly with weapons.

Chalk Farm

[Cockney slang]arm

long arm

Influence; far-reaching power.

long arm of the law

The influence or effectiveness of law enforcement institutions; law enforcement officers collectively.

take someone's arm

To take hold of someone by their arm; to link arms with someone.