own up

own up idiom
Confess, make a full admission, as in Come on, Tim, you'd better own up that you lost the car keys. This idiom uses the verb own in the sense of “acknowledge.” [Colloquial; mid-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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