- past; gone by; earlier; former: The faded photograph brought memories of bygone days.
- Usually bygones. that which is past: Let’s not talk of bygones.
- let bygones be bygones, to decide to forget past disagreements; become reconciled: Let’s let bygones be bygones and be friends again.
- (usually prenominal) past; former
- (often plural) a past occurrence
- (often plural) an artefact, implement, etc, of former domestic or industrial use, now often collected for interest
- let bygones be bygones to agree to forget past quarrels
adj.early 15c., from by (adv.) + gone. Cf. similar construction of aforesaid. As a noun from 1560s (see bygones). Let past offenses and problems stay in the past; don’t let them taint the present. 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]