This is the 7947th most frequent Polish word.
musića
It seems there may be a small typo in the word provided. If you meant "musić," it does not exist in Polish. However, "musi" means "must" or "has to" (third person singular form of the verb "musieć"). Let me know if you meant something else!
In this sentence, 'musieć' is conjugated in the first person singular present tense 'muszę', indicating a necessity or obligation.
Muszę udać się na spotkanie.
I must attend the meeting.
Here, 'musieć' is conjugated in the second person singular present tense 'musisz', expressing a requirement or need.
Czy musisz iść już teraz?
Do you have to go right now?
In this case, 'musieć' is used in the third person plural past tense 'musieli', signifying a necessity that occurred in the past.