[n] a boxer who weighs no more than 135 pounds
[n] a wrestler who weighs 139-154 pounds
[n] someone who is unimportant but cheeky and presumptuous
[adj] having relatively little weight; "lightweight fabrics"
[adj] of a weight class of 126-135 lbs for boxers; "the lightweight title"
[adj] having no importance or influence; "a lightweight intellect"