Good Egg

Also: Good scout

Meaning of Idiom ‘Good Egg’

A good egg is a good, nice, and trustworthy person.

Good egg is the opposite of a bad egg.

Examples Of Use

“That Peter is a good egg. He’s always helping out.”

“Thanks for taking my shift yesterday. You’re a good egg.”

“Be a good scout and fetch me that wrench,” said Dad.

Origin

Good egg arose in the early 1900s as an antonym for bad egg. 1Ammer, Christine. American Heritage Dictionary of Idioms]. Boston: Houghton Mifflin Harcourt, 2013.
It alludes to a person who is just as they apper to be, wholesome and kind.

More Idioms Starting with G

More Character Idioms

More Egg Idioms

More Food Related Idioms

More ‘Good’ Idioms

More Positive Character Idioms

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Sources   [ + ]

1. Ammer, Christine. American Heritage Dictionary of Idioms]. Boston: Houghton Mifflin Harcourt, 2013.