Meaning of wrong number

wrong' num'ber

Pronunciation: [key]
  1. (in telephoning)
    1. a call made to a number other than the one intended.
    2. the number or person reached through such a call.
  2. Me cook a gourmet dinner?--You've got the wrong number!
    1. the wrong person for a particular task, role, or situation:Me cook a gourmet dinner?--You've got the wrong number!
    2. an inadequate, disagreeable, or repulsive person:She's OK, but her brother's a wrong number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.