You are a sitting duck out there. Get in here where the enemy cannot fire at you.The senator was a sitting duck because of his position on school reform.

When the prizefighter was knocked out in his third fight, the newspapers said he had a glass jaw.Once a fighter has a glass jaw, he's finished as a boxer.

The old man was a sitting target for the burglars. He lived alone and did not have a telephone.People recently hired will be sitting targets if the company needs to cut back.