|1.||(usually prenominal) past; former|
|2.||(often plural) a past occurrence|
|3.||(often plural) an artefact, implement, etc, of former domestic or industrial use, now often collected for interest|
|4.||let bygones be bygones to agree to forget past quarrels|
Let past offenses and problems stay in the past; don't let them taint the present.
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]