WordWeb Online

1. A man's testicles
   - cobblers [Brit, informal]

1. Someone who buys old buildings or ships and breaks them up to recover the materials in them
    
2. Someone who buys up old horses for slaughter

1. Exhaust or get tired through overuse or great strain or stress
   "We knackered ourselves out on this hike";
   - tire, wear upon, tire out, wear, weary, jade, wear out, outwear, wear down, fag out [Brit, informal], fag [informal], fatigue

Type of: butcher, indispose, slaughterer, testicle, testis, wrecker

Encyclopedia: Knackers