- feather-weight (n.)
[feather-weight 词源字典]
- also featherweight, "lightest weight allowable by rules," 1812 (earlier as simply feather, 1760), from feather (n.) + weight (n.). Originally in horse-racing; boxing use as a specific weight class dates from 1889.[feather-weight etymology, feather-weight origin, 英语词源]