A bonus, something for nothing, as in What do you want—egg in your beer? This expression dates from about 1940 and became widespread during World War II. The origin is unknown, since adding egg to beer does not improve the taste.
[eg] /ɛg/ noun 1. the roundish reproductive body produced by the female of certain animals, as birds and most reptiles, consisting of an ovum and its envelope of albumen, jelly, membranes, , or shell, according to species. 2. such a body produced by a domestic bird, especially the hen. 3. the contents of an egg […]
/ˈɛɡlə/ noun 1. (archaic or dialect) an egg dealer: sometimes itinerant
[eg-uh l-stuh n] /ˈɛg əl stən/ noun 1. Edward, 1837–1902, U.S. author, editor, and clergyman.
- Egg membrane
egg membrane n. Any of the membranes forming the investing envelope of the ovum.