cost an arm and a leg

: the amount or equivalent paid or charged for something : price

: the outlay or expenditure (as of effort or sacrifice) made to achieve an object

: loss or penalty incurred especially in gaining something

: to require expenditure or payment

: to require effort, suffering, or loss

: to have a price of

: a human upper limb

: something like or corresponding to an arm: such as

: the forelimb of a vertebrate

: to furnish or equip with weapons

: to furnish with something that strengthens or protects

: to equip or ready for action or operation

: a means (such as a weapon) of offense or defense

: a combat branch (as of an army)

: an organized branch of national defense (such as the navy)

: a limb of an animal used especially for supporting the body and for walking: such as

: one of the paired vertebrate limbs that in bipeds extend from the top of the thigh to the foot

: the part of such a limb between the knee and foot

: to use the legs in walking