take someone's arm

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

another nail in someone's coffin

An event that increases the likelihood of or causes further failure.

answer someone's prayers

To be or do exactly what someone has been wishing or asking for.

answer to someone's prayers

Exactly what someone has been wishing or asking for.

apple of someone's eye

The object of somebody's affections; a person (or sometimes a thing) that someone strongly prefers; a favorite, a loved one.

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.

arm up

to supply, or be supplied with, arms (weapons)