/buy"gawn', -gon'/ , adj.
1. past; gone by; earlier; former: The faded photograph brought memories of bygone days.
n.
2. Usually, bygones . that which is past: Let's not talk of bygones.
3. let bygones be bygones , to decide to forget past disagreements; become reconciled: Let's let bygones be bygones and be friends again.
[ 1375-1425; late ME (north) by-gane; see GONE, BY 1 ]