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bygone

[bahy-gawn, -gon]
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adjective
  1. past; gone by; earlier; former: The faded photograph brought memories of bygone days.
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noun
  1. Usually bygones. that which is past: Let's not talk of bygones.
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Idioms
  1. let bygones be bygones, to decide to forget past disagreements; become reconciled: Let's let bygones be bygones and be friends again.
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Origin of bygone

1375–1425; late Middle English (north) by-gane; see gone, by1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for let bygones be bygones

bygone

adjective
  1. (usually prenominal) past; former
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noun
  1. (often plural) a past occurrence
  2. (often plural) an artefact, implement, etc, of former domestic or industrial use, now often collected for interest
  3. let bygones be bygones to agree to forget past quarrels
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for let bygones be bygones

bygone

adj.

early 15c., from by (adv.) + gone. Cf. similar construction of aforesaid. As a noun from 1560s (see bygones).

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Online Etymology Dictionary, © 2010 Douglas Harper

let bygones be bygones in Culture

Let bygones be bygones

Let past offenses and problems stay in the past; don't let them taint the present.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with let bygones be bygones

let bygones be bygones

What's done is done; don't worry about the past, especially past errors or grievances. For example, Bill and Tom shook hands and agreed to let bygones be bygones. [First half of 1600s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.