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"farewell" is also used as a crossword clue. If that's what you saw, the answer is often goodbye (7 letters).
Definitions
the act of departing politely
Word origin
From fare + well.
Used in a sentence
“He bid farewell to all of his fans.”
“The last train—a three-coach A.E.C. unit—from Belfast to Crumlin and back, was bade farewell with fog signals as it carried a capacity crowd of last-trip travellers.”
“See how the morning opes her golden gates, And takes her farewell of the glorious sun.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Expression said at parting”8 letters
02“Goodbye”8 letters
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