Real Dictionary

egg
countable noun: An egg is an oval object that is produced by a female bird and which contains a baby bird. Other animals such as reptiles and fish also lay eggs.
variable noun: In Western countries, eggs often means hen's eggs, eaten as food.

egg in American English 1
the oval or round body laid by a female bird, fish, reptile, insect, etc., containing a supply of nutrients, a protective membrane, and, when fertilized, the embryo of a new individual: many kinds of eggs have a thin, brittle shell as an outer covering
noun: 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, egg case, or shell, according to species

egg in American English 2
to urge or incite
transitive verb: to incite or urge; encourage

egg in British English 1
noun: the oval or round reproductive body laid by the females of birds, reptiles, fishes, insects, and some other animals, consisting of a developing embryo, its food store, and sometimes jelly or albumen, all surrounded by an outer shell or membrane

egg in British English 2
verb: to urge or incite, esp to daring or foolish acts