from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To surpass in singing; to sing better than.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To surpass in singing. See breast, n., 6.
from The Century Dictionary and Cyclopedia
- To surpass in power of breast, chest, or voice; outsing.
out- + breast (Wiktionary)