What does aby or abye mean?
The definition of aby and abye
A*by”, A*bye”, v. t. & i.
[imp. & p. p. Abought.] Etym: [AS. abycgan to pay for; pref. a- (cf. Goth. us-, Ger. er-, orig. meaning out) + bycgan to buy. See Buy, and cf. Abide.]

1 To pay for; to suffer for; to atone for; to make amends for; to give satisfaction. [Obs.] Lest to thy peril thou aby it dear. Shak.
2 To endure; to abide. [Obs.] But nought that wanteth rest can long aby. Spenser.