YOU SAID:

that will cost an arm and a leg

INTO JAPANESE

それは腕と脚の費用がかかります

BACK INTO ENGLISH

it costs an arm and a leg

INTO JAPANESE

腕と脚がかかる

BACK INTO ENGLISH

it takes arms and legs

INTO JAPANESE

腕と脚が必要

BACK INTO ENGLISH

need arms and legs

INTO JAPANESE

腕と脚が必要

BACK INTO ENGLISH

need arms and legs