word of honor

word of honor idiom
A pledge of one's good faith, as in On his word of honor he assured us that he was telling the truth. [Early 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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