This is not an idiom that I have ever heard. Perhaps you mean an arm AND a leg, which is an exaggerated way of saying something is really expensive.
This leg of mine, do you want to buy it? It costs an arm and a leg.
It costs an arm and a leg
Then you will remain short. There is human growth hormone available, but not much and it costs an arm and a leg.
more then you could give or pay then priceless bodily limbs, that are expensive on black market"An arm and a leg" is an idiom that means an exorbitant or very high price paid for something. "Jeeze, did you see that they're charging an arm and a leg for a gallon of gas these days!"
A.L.L.A.H.=Arm, Leg, Leg, Arm, Head. The 5 Percent Nation believe that man is God.
by using incredible force, such as banging it against a tree or falling really hard on one arm
your leg
leg
your leg
arm - aim - aid - lid - led - leg
The Esperanto words for arm and leg are brako and kruro.