Definition of mismatch
plural mismatches
: a faulty or unsuitable match
- New England plays St. Louis in Super Bowl XXXVI this evening, and on the face of it, this game is a mismatch, a blowout waiting to happen.
- —William C. Rhoden
- She is blood type O, and the donor heart and lungs she received in the first operation were blood type A. That mismatch triggered rejection by her immune system.
- —Dan Vergano
