Noun

(en noun)

A toroidal bread roll that is boiled before it is baked.

(tennis, slang) A score of 6-0 in a set (after the shape of a bagel, which looks like a zero).

* {{quote-news, year=2011

, date=January 30 , author=Piers Newbery , title=Australian Open: Djokovic too good for Murray in final , work=BBC citation , page= , passage=The Scot, who had been close to a two-set deficit in his semi-final against David Ferrer, avoided the dreaded bagel by seeing off a set point at 5-0 down before finally breaking the Djokovic serve to love as he began to go for his shots with the set seemingly gone. }}

(slang, among South African Jews) An overly materialistic and excessively groomed young man.

Noun

(en noun)

A type of bread dough leavened with yeast and lactobacilli that produce acids giving a sour taste.

(slang) An old-timer, especially in Alaska.

* 1944, , Brave Men , University of Nebraska Press (2001), page 80:

"The troops went for those fresh tomatoes like sourdoughs going for gold in the Klondike."

(Yukon) A permanent resident of the territory. Someone who has lived in the Yukon during all four seasons.