Something that is lightweight weighs less than most other things of the same type.
例句
...lightweight denim...輕磅牛仔面料The company manufactures a range of innovative light-weight cycles.這家公司生產(chǎn)一系列的新型輕便自行車。
N-UNCOUNT
（拳擊、柔道、賽艇等運動中的）輕量級
Lightweight is a category in some sports, such as boxing, judo, or rowing, based on the weight of the athlete.
例句
By the age of sixteen he was the junior lightweight champion of Poland...16歲時他已經(jīng)是波蘭的青少年組輕量級冠軍。He changed from lightweight (under 71kg) to light middleweight (under 78kg).他從輕量級（71公斤以下）轉(zhuǎn)到了輕中量級（78公斤以下）。
N-COUNT
無足輕重的人；無能的人
If you describe someone as a lightweight, you are critical of them because you think that they are not very important or skilful in a particular area of activity.
例句
Hill considered Sam a lightweight, a real amateur.希爾認(rèn)為薩姆無足輕重，是個十足的生手。
英漢詞典釋義
adj.
輕量的,薄型的
These garden shears are lightweight and easy to use.這些園丁剪刀又輕又好用。
n.
體重低于通常重量的人;比通常重量輕的東西
The Oxford eight is〔are〕 using a new lightweight boat.牛津八人劃船隊使用的是新的輕量船。
英英詞典釋義
Noun
1. a professional boxer who weighs between 131 and 135 pounds
2. someone who is unimportant but cheeky and presumptuous
3. an amateur boxer who weighs no more than 132 pounds