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In racing, the lightest weight allowed by the rules to be carried by a horse in a handicap.
(noun)
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In sporting, a boxer, etc., whose weight falls within the lowest of the divisions prescribed by the rules —heavy-weight, middle-weight, light-weight, and feather-weight; hence, a very light weight, or a person of very light weight.
(noun)
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A frivolous or flippant person; one of slight ability, influence, or importance.
(noun)
The Century Dictionary (Public Domain)