"lightweights" in the noun sense
1. lightweight
a professional boxer who weighs between 131 and 135 pounds
2. whippersnapper, jackanapes, lightweight
someone who is unimportant but cheeky and presumptuous
3. lightweight
an amateur boxer who weighs no more than 132 pounds
4. lightweight
a wrestler who weighs 139-154 pounds
Source: WordNet® (An amazing lexical database of English)
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