mistake (someone or something) for (someone or something)

mistake (someone or something) for (someone or something)

To confuse someone or something for someone or something else. I always mistake Kelly for her sister. They just look so much alike!
See also: mistake
Farlex Dictionary of Idioms.

mistake (someone) for (someone else)

 and mix (someone) up with (someone else)
to confuse someone with someone else; to think that one person is another person. I'm sorry. I mistook you for John. Tom is always mistaking Bill for me. We don't look a thing alike, though. Try not to mix Bill up with Bob, his twin.
See also: mistake

mistake (something) for (something else)

 and mix (something) up with (something else)
to confuse two things with each other. Please don't mix this idea up with that one. I mistook my book for yours.
See also: mistake
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

mistake for

Take someone or something for someone or something else, as in I'm sorry, I mistook you for her sister, or Don't mistake that friendly smile for good intentions; he's a tough competitor. [c. 1600]
See also: mistake
The American Heritage® Dictionary of Idioms by Christine Ammer.

mistake for

v.
To wrongly perceive that someone or something is someone or something else: I'm sorry to have bothered you—I mistook you for a friend of mine. Don't mistake the poison ivy for a box elder vine!
See also: mistake
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • mistake for
  • be in bad with (someone)
  • and no mistake
  • and no mistake!
  • by mistake
  • burnt
  • a burnt child dreads the fire
  • come down on
  • come down on (someone or something)
  • dearly