This is the 13509th most frequent Russian word.
нарушить
To violate or breach.
Here, 'нарушить' is used to mean 'to break' or 'to violate' in the context of rules or laws.
Он боится нарушить правила.
He fears breaking the rules.
'Нарушить' in this sentence means 'to disturb' or 'to interrupt' in the context of someone's state, like sleep.
Она не хотела нарушить его сон.
She did not want to disturb his sleep.
In this example, 'нарушить' refers to 'disrupting' or 'interfering with' a balance or system.