This is the 10324th most frequent Russian word.
брюк
"Брюк" is not a standalone word in Russian; it appears to be an incomplete form of "брюки," which means "trousers" or "pants."
In this sentence, 'брюк' describes the pants being referred to, showing its plural form and the association with fit.
Эти брюк хорошо сидят.
These pants fit well.
Here, 'брюк' is used in the genitive plural form to describe a pair of pants, a commonly singular used clothing item referred to generally in the plural.
Я купил пару новых брюк.
I bought a new pair of pants.
'брюк' in this sentence is used within a genitival construction to denote possession while maintaining the plural form in relation to the pants.