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1. An incorrect telephone number. A: "Hello, is this the Thompson residence?" B: "Sorry, wrong number." A: "Hello, FlemCo Customer Support, Tracy speaking. How may I help you?" B: "Oops, I must have the wrong number."
2. A caller who is trying or tried to reached a different telephone number. A: "Who was that on the phone?" B: "I don't know, must have been a wrong number." I figured it was a wrong number because of how late it was, so I didn't bother answering it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. Lit. an incorrect telephone number. (*Typically: get ~; have ~; dial ~; give someone ~.) He got the wrong number and hung up. When a young child answered, I knew I had the wrong number.
2. Fig. [a state of being] incorrect, late, inaccurate, etc. (*Typically: get ~; have ~; give someone ~.) Boy, do you have the wrong number! Get with it! You have missed the boat again. You have the wrong number!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.