Multiple realities
(covers information from several alternate timelines)
Welsher redirects here; for the Welsh language, please see Welsh.
A debtor was someone who owed money to another, a creditor. On Earth, those who did not pay their debts were sometimes imprisoned in debtor's prison. A welsher was a derogatory term for a debtor.
If it were not for the Q Quinn, Isaac Newton would have become a debtor, suspected in several prostitute murders. (VOY: "Death Wish")
In an alternate timeline 1944, Sal described Joe Prazki as a welsher and a drunk, adding that he was less than trustworthy. (ENT: "Storm Front")
In 2375, while praying, Quark described himself as the Blessed Exchequer's most devoted debtor. (DS9: "The Emperor's New Cloak")