sitting duck

From sitting + duck.

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sitting duck (plural sitting ducks)

1. (idiomatic) An obvious or unconcealed target.

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

   • 2010, BioWare, Mass Effect 2 (Science Fiction), Redwood City: Electronic Arts, OCLC 865290061, PC, scene: Normandy SR-2:

     Joker: We're sitting ducks out here. I have to try to lose them in the debris field!

   • 2023 February 13, Andrew E. Kramer, “‘Our Losses Were Gigantic’: Life in a Sacrificial Russian Assault Wave”, in The New York Times‎, ISSN 0362-4331:

     The soldiers were sitting ducks, sent forth by Russian commanders to act essentially as human cannon fodder in an assault.

• easy mark, easy target

• dead duck