Words similar to tip-off

Example sentences for: tip-off

How can you use “tip-off” in a sentence? Here are some example sentences to help you improve your vocabulary:

Another tip-off is that Hatfield doesn't discuss his three high-level, inside-the-enemy-camp sources in the body of the book, which was already in galleys when the author made his "discovery."
The tip-off is that he notes (in the seventh paragraph) that there are "21 such shootings annually"--not too statistically significant, given that there are nearly 20,000 gun deaths per year.
It is sometimes difficult to determine if it's real or if it's Memorex, though build, voice, and the hint of a beard can sometimes be a tip-off.