Basically, it means forget the past. What has gone by (passed) has gone by.
forget the things that have pass
The correct spelling is 'Let the bygones be bygones' meaning to forget any old problems that may exist between us
Let Bygones Be Bygones
That is the correct spelling of the plural noun "bygones" (its modern use is mostly relegated to the proverbial let bygones be bygones).
Scotland in the 16th Century.
The Real Housewives of Orange County - 2006 Let Bygones Be Bygones - 5.8 was released on: USA: 14 January 2010
The Real Housewives of Orange County - 2006 Let Bygones Be Bygones 5-8 was released on: USA: 14 January 2010
It means 'forget the bad things which happened in our past.' "You and I have always fought like cats and dogs over every detail of running the business. I'm prepared to let bygones be bygones, so how about we shake hands and try to be friends?"
absolve, accept (someone's) apology, acquit, bear no malice, condone, excuse, exonerate, let bygones be bygones, let off (informal) pardon, remit
The proverb "let bygones be bygones" means to forget past disagreements, grievances, or conflicts and move on without harboring resentment. It encourages individuals to put aside old issues and not dwell on past mistakes or hurt feelings, promoting forgiveness and reconciliation. Essentially, it emphasizes the importance of focusing on the present and future rather than being weighed down by past troubles.
ER - 1994 Bygones 8-17 was released on: USA: 28 March 2002
absolve, accept apology, acquit, allow for, amnesty, bear no malice, bear with, bury the hatchet, clear, commute, condone, dismiss from mind, efface, exculpate, excuse, exempt, exonerate, extenuate, forget, kiss and make up, laugh off, let bygones be bygones, let it go, let off easy, let off, let pass, let up on, make allowance, overlook, palliate, pocket, purge, release, relent, remit, reprieve, respite, spring, think no more of, turn other cheek, wink at, wipe slate clean