Suing means taking someone to court because you believe they have done something wrong and you want the court to make it right.
Suing can feel serious and sometimes stressful. It's like asking a teacher to help solve a problem.
Examples:
She is suing her neighbor for being too loud.
The company is suing the other company for copying their idea.
He is suing the store for selling him a broken toy.
The cat is suing the dog for taking its bed.
I am suing the weather for ruining my picnic.
The superhero is suing the villain for making a mess in the city.