A contraction of God be with you. Similar to the French
adieu, which is à Dieu (I commend you to God).
Some object to the substitution of “God” in this phrase, reminding
us of our common phrases good day, good night, good morning, good
evening; “Good be with ye” would mean may you fare well, or good
abide [with you].
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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