MUCK means when something is really, really dirty, messy, or covered in yucky stuff. Imagine you’re playing outside after it rained, and you jump in a big puddle. The mud and dirt that splashes all over your shoes and clothes? That’s muck! Or if you haven’t cleaned your room in a long time, and there are toys, clothes, and maybe even old snack wrappers everywhere, you could say your room is full of muck. It’s just a fun word for a big mess or a lot of dirt!

So, if someone says, “Look at all that muck!” they’re probably talking about something super dirty that needs to be cleaned up.