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

:  the part between the shoulder and the wrist

:  something like or corresponding to an arm: such as

:  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

:  firearm

:  a combat branch (as of an army)

:  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

:  run

: legal

: legato

: legislative; legislature