When the underdog starts winning, at what point does the word cease to apply?

[$LakerGold]

:confusedshrug:

[bballnoob1192]

a title in whatever they are playing

[Patrick Chewing]

Never. People love to hang on to crutches.

[Rake2204]

I believe the term "underdog" is largely, if not entirely, based on perception. It's just a matter of whether the team in question is widely expected to lose prior to an event.