to finish/furnish
Exartizo describes bringing something to completion or being fully equipped for the stated purpose.
The two occurrences show completion in two settings: finishing specified days before departure and being presented as complete and equipped for every good work.
Senses in use
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Completing a stated period · dominant
In Acts 21:5, the aorist active infinitive occurs in the clause about finishing the days before the group went on its way; the APB renders the clause "we had finished the days."
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Being made complete and equipped · occasional
In 2 Timothy 3:17, the perfect passive participle describes the man of God in relation to every good work; the APB renders the verse "may be complete, equipped for every good work."
In the Anselm Project Bible: The APB presents the Acts clause with "finished the days" and the 2 Timothy description with "complete, equipped for every good work." These phrases confirm the clauses' overall presentation rather than isolate a fixed English equivalent.