名詞 lightweight:

1. a professional boxer who weighs between 131 and 135 pounds
2. someone who is unimportant but cheeky and presumptuous
   同義詞：whippersnapper, jackanapes
3. an amateur boxer who weighs no more than 132 pounds
4. a wrestler who weighs 139-154 pounds

形容詞 lightweight:

1. having no importance or influence

1. One of the lightweight circular supports for a hoop skirt.
   撐裙箍帶裙環(huán)女裙中的很輕的環(huán)形支撐物
2. Lightweight clothing; a lightweight wood.
   比較輕的衣物; 比較輕的木材
3. A fine, lightweight, silk and wool or cotton and wool dress fabric.
   毛葛，棉毛呢一種精制且輕的絲毛或棉毛的服裝紡織品
4. A lightweight canoe that is similar in construction.
   小艇結構與愛斯基摩劃子相似的重量輕的小舟

light.weight

n.（名詞）
One that weighs relatively little or less than average.
輕量級：體重相對較輕的或在平均重量以下的人（或動物）
Sports
【體育運動】
A professional boxer weighing more than 2' and not more than 35 pounds (approximately 57-' kilograms), heavier than a featherweight and lighter than a welterweight.
輕量級拳手：體重在2'到35磅（57-'公斤）之間的職業(yè)拳手，其體重重于次輕量而輕于次中量級的拳手
A contestant in various other sports in a similar weight class.
在其他比賽中的相似的體重級別
A person of little ability, intelligence, influence, or importance.
才智不足者，不重要的人：處于相似重量級的選手智力或能力低下、無影響力或重要性的
adj.（形容詞）
Weighing relatively little; not heavy:
重量輕的；不重的：
例句：
lightweight clothing; a lightweight wood.
比較輕的衣物；比較輕的木材

Sports Of, relating to, or characteristic of a lightweight:
【體育運動】 輕量的、與之相關的或有之特性的：
例句：
the lightweight title.
輕量級冠軍

Having no significance or influence:
無足輕重的或沒有影響力的：
例句：
a lightweight intellect.
一個無足輕重的知識分子