What is "sharpers"

Usage examples of "sharpers".

Next morning everyone knew you were here and had sent a challenge to the three sharpers, but the universal opinion was that they were too knowing to risk their lives by meeting you.

The next day Barbaro, who was as honest as most professional sharpers are, brought me the two hundred sequins I had lent him, with a profit of two hundred more.

This was the inn where Piccolomini and his wife were staying, and I found them there in the midst of a horde of cheats and sharpers, like themselves.

I played a little and waged war against the sharpers who have become more numerous of late than the dupes, as there are also more doctors than patients.