Bȳ'-gōne1, a.
(21), a. Past; gone by. “By-gone fooleries.” Shak.
2 entries under this word
Bygone
Bŷ'-gōne2, n.
n. Something gone by or past; a past event. “Let the old by-gones be.” Tennyson.
Let by-gones be by-gones, let the past be forgotten.