eggs
"Eggs" is the plural of "egg" — a word with a surprisingly wide range of meanings! Most commonly, you think of the oval objects laid by birds, but "egg" also appears as a verb and in some figurative uses. Here are the most important senses.
An egg is the oval or round object produced by a female bird, reptile, or fish, which may contain a developing baby animal. In everyday life, when people say 'eggs', they almost always mean chicken eggs — one of the most common foods in the world. Think of the egg you crack open to make breakfast.
everyday language, cooking, biology · Modern, widely used
When you 'egg someone on', you encourage or push them to do something — usually something risky, silly, or that they are hesitant to do. You are not physically doing anything; you are using words or pressure to motivate them. This phrase is almost always used as 'egg on', not alone.
everyday language · Modern, widely used · figurative
In older or informal British English, 'egg' was used to describe a person, usually with an adjective in front of it. For example, a 'good egg' means a kind, reliable person, and a 'bad egg' means someone untrustworthy. You won't hear this much in modern conversation, but you may read it in older books.
informal, everyday language · Informal, more common in older texts · figurative