Used mainly in sports, not in casual conversations unless discussing sports. She's interested in the bantamweight competition next month.
Pro Tip 2/3
Not Featherweight
'Bantamweight' and 'Featherweight' are different classes, don't confuse them. He moved from bantamweight to featherweight last year.
Pro Tip 3/3
Precision Matters
In sports, weight categories are precise. 'Bantamweight' refers to an exact range. The fighter had to lose 2 pounds to remain in the bantamweight class.