behave fatally
The Spanish phrase 'comportarse fatal' does not exactly translate to 'behave fatally' in English. It rather signifies behaving very badly or having a terrible behavior. This phrase is often used informally to express dissatisfaction with someone's behavior.
Due to her bad behavior, her mother punished her.
In this sentence, 'comportarse fatal' refers to the action of the girl who behaves badly and as a result, she is punished by her mother.
I am surprised that you can behave so badly with such ease.
In this context, the speaker is expressing surprise over how easily the other person can behave badly ('comportarse fatal').
Avoid behaving badly in public.
This sentence is advising against behaving badly ('comportarse fatal') in public situations.
Children tend to behave badly when they are tired.
This statement is expressing that children often behave badly ('comportarse fatal') when they're tired.
You're starting to behave badly, you need to calm down.
In this phrase, the speaker observes that the other person is beginning to behave badly ('comportarse fatal') and suggests they need to calm down.
It's normal to behave badly when you're frustrated.
This statement suggests that it's a common reaction to behave badly ('comportarse fatal') when feeling frustrated.
It's hard to be around someone who always behaves badly.
The sentence expresses the difficult of being around someone who consistently behaves badly ('comportarse fatal').
Just when I thought you couldn't behave worse, you started behaving really badly.
In this sentence, the speaker is expressing disappointment towards the other person's behavior, stating that it's even worse ('comportarse fatal') than before.
On her birthday I hoped she would not behave badly, but she did.
The phrase conveys that the speaker's hopes were not met as the person behaved badly ('comportarse fatal') on her birthday.
If you continue to behave badly, you will not be able to come on the next outing.
The sentence warns that continued bad behavior ('comportarse fatal') will result in not being able to participate in the next outing.