- [noun] an informal form of address for a man; "Say, fellow, what are you doing?"; "Hey buster, what's up?"
- [noun] a robust child
- [noun] a person who breaks horses
- [noun] a person (or thing) that breaks up or overpowers something; "dam buster"; "sanction buster"; "crime buster"
- [noun] a person born in the generation following the baby boom when the birth rate fell dramatically
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