in sporting use, a variant of by (prep). Originally in cricket, "a run scored on a ball that is missed by the wicket-keeper" (1746); later, in other sports, "position of one who is left without a competitor when the rest have drawn pairs" (1883), originally in lawn-tennis.
bye (2)
shortened form of good-bye. Reduplication bye-bye is recorded from 1709, though as a sound used to lull a child to sleep it is attested from 1630s.
实用例句
1. He stood mournfully at the gate waving bye bye.
他伤心地站在门口，挥手告别。
来自柯林斯例句
2. Dickens felt compelled to return to the stage for a final good-bye.