fill the bill

fill the bill idiom
Serve a particular purpose well, as in I was afraid there wasn't enough chicken for everyone, but this casserole will fill the bill, or Karen's testimony just fills the bill, so we're sure to get a conviction. This expression alludes to adding less-known performers to a program (or bill) in order to make a long enough entertainment. [First half of 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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