Light"weight` (?), n. One of less than average weight; specif.: (a) In boxing, wrestling, etc., one weighingnot more than 133 pounds (U. S. amateur rules 135 pounds, Eng. 140 pounds). (b) A person of small impotance or mental ability. [Colloq., Chiefly U. S.]

Light"weight`, a. Light in weight, as a coin; specif., applied to a man or animal who is a lightweight.

Light"weight` (?), n. One of less than average weight; specif.: (a) In boxing, wrestling, etc., one weighingnot more than 133 pounds (U. S. amateur rules 135 pounds, Eng. 140 pounds). (b) A person of small impotance or mental ability. [Colloq., Chiefly U. S.]

Light"weight`, a. Light in weight, as a coin; specif., applied to a man or animal who is a lightweight.

• a boxer in a weight division having a maximum limit of 135 pounds for professionals and 132 pounds for amateurs
  
• one of little consequence or ability
  
• person who can't handle their drink
  
• lacking in earnestness, ability, or profundity
  
• having less than average weight