take for dead
take (one) for dead
To mistakenly assume or believe that one is dead. The bandits took the woman for dead, but she survived and swore revenge against them all. I took the creature for dead, but it leaped up and bit me on the arm when I approached it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
take someone for dead
to assume that someone who is still alive is dead. When we found her, we took her for dead, but the paramedics were able to revive her. He was taken for dead and abandoned. take someone for someone or something to perceive someone as someone or something. I took you for a fairly even-tempered person. You aren't. Alice took Jim for a gentleman—which he was.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.