sitting duck

If any of the Company ships sight us, we'll be a sitting duck.

There is a very dangerous time when the driver is a sitting duck.

There were three eggs in the inaccessible cliff-nest, and he brought me one, which I tried in vain to hatch under a sitting duck.

Six great green eggs, stolen from a sitting duck which had belonged to the ill-fated Pierce, were the staple food.

A weaving target has a chance, but a target standing motionless is a sitting duck and his life hangs by a hair.