Meaning of Tommy John in English:

Tommy John

Pronunciation /ˌtɒmɪ ˈdʒɒn/

noun

Surgery
  • Attributive Designating surgery in which the ulnar collateral ligament in the elbow is replaced with another tendon from elsewhere in the patient's body or from a cadaver; of or relating to such surgery. Frequently in "Tommy John surgery".

    Tommy John surgery is typically carried out on professional baseball players, especially pitchers, because repetitive, hard throwing motion can cause damage to the ulnar collateral ligament.

Origin

1980s; earliest use found in The Chicago Daily Herald. From the name of Tommy John (Thomas Edward John Jr.) (b. 1943), U.S. baseball player, who was the first person to undergo surgery of this kind in 1974.