from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One who espouses; one who embraces or adopts the cause of another.
from the GNU version of the Collaborative International Dictionary of English
- n. One who espouses; one who embraces the cause of another or makes it his own.
from The Century Dictionary and Cyclopedia
- n. One who espouses, or betroths or weds.
- n. One who defends or maintains something, as a cause.
espouse + -er (Wiktionary)