buck up

buck up idiom
Cheer up, become encouraged, as in Buck up! We'll soon have it done, or Even the promise of a vacation did not buck her up. This term was first recorded in 1844.

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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