Pronunciation: (chēr'ē-ō", chēr"ē-ō'), [key]
—interj., n., pl. cheer•i•os. Chiefly Brit.
1. good-bye; good-bye and good luck.
2. (used as a toast to one's drinking companions.)
1. a good-bye or farewell.
2. a toast of “cheerio!”
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.