sitting duck

idiomatic

(idiomatic) An obvious or unconcealed target.

Japanese Meaning

明らかに狙われやすく、無防備な標的

Walking alone through the poorly lit parking lot made her a sitting duck for muggers.

薄暗い駐車場を一人で歩いていたため、彼女は強盗にとって格好の標的になった。

Sense（1）

(idiomatic) An obvious or unconcealed target.

For God's sake, Sergeant, we need to get to cover – we're sitting ducks out here.

sitting ducks

（ plural ）