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ADJ-GRADED
輕量的；輕質的；比通常重量輕的
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.
這家公司生產一系列的新型輕便自行車。
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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）轉到了輕中量級（78公斤以下）。
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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.
希爾認為薩姆無足輕重，是個十足的生手。