In English "Meow!" is how we describe the sound that a cat makes.
You can turn "meow" into a verb by adding "-ing" to the end:
Lucy is meowing. She must be hungry.
This is true for some other animal noises:
The cow is mooing.
The ducks are quacking.
But it doesn't always work. For example, when a dog or a bear is angry, it makes this sound:
But there's a special verb for making this sound, which is "growling".