This is the 23rd most frequent Romanian word.
are
"Are" in Romanian means "has" in English.
In this sentence, 'are' is the third person singular form of the verb 'a avea' (to have). It is used to indicate possession.
El are o carte pe masă.
He has a book on the table.
Here, 'are' still means 'to have' in the third person but is used in a question to inquire about possession or availability.
Are cineva întrebări?
Does anyone have questions?
In this case, 'are grijă' translates to 'takes care,' showing a figurative usage where 'are' forms part of an idiomatic expression when combined with 'grijă' (care).