✔ 最佳答案
an arm and a leg 係一隻手臂同一條腿
圖片參考:
http://hk.yimg.com/i/icon/16/10.gif
英文有句 idiom 係 cost an arm and a leg;cost 係價值咁解,如果一樣要你俾一隻手臂同一條腿o既代價去換,你話係唔係貴到離哂譜?所以 cost an arm and a leg 係解好鬼貴,如:
Don't tell me you want that diamond ring for your birthday present! It costs an arm and a leg!