The lion's share

Photo of a lion.
The lion's share means the largest or most valuable part of something. People use this idiom in a situation when one person takes much more than everyone else.

The expression comes from an ancient fable by Aesop in which a lion joins other animals on a hunt. When it is time to divide the food, the lion claims all of it for himself, leaving nothing for the others.

She did most of the work on the project, but someone else took the lion's share of the credit.