Meaning: すごくお金のかかる、目が飛び出るほど高価な
For Example:
‣ I bumped my car into the wall of the garage last week, and it costed an arm and a leg to fix it.
車庫の壁に先週車ぶつけてしもて、修理するんにがいにいったわ。
‣ You should buy that dress. It looks perfect on you and it doesn't cost you an arm and a leg.
あのドレス買うべきや。すごく似合てたし、そんなに目が飛び出るほど高いわけでもない やん。
Synonym:
very expensive, very costly