What does muck losing or uncalled hands mean in poker?

I finally noticed some XP gain when I decided to show my cards upon folding to a bet, and the rep reward was called Muck it Correct me if I'm wrong,

muck That hand put Tamayo into the lead and Tamayo would keep the pressure on Griff throughout the rest of the tournament Although Griff

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what legal action can ola take if dues not paid I finally noticed some XP gain when I decided to show my cards upon folding to a bet, and the rep reward was called Muck it Correct me if I'm wrong,