This is the 3121st most frequent Portuguese word.
calça
Pants.
Here, 'calça' is used to refer to a specific article of clothing, commonly understood as trousers or pants.
Eu comprei uma calça nova ontem.
I bought a new pair of pants yesterday.
In this instance, 'calça' again refers to trousers or pants but is used in a possessive context to comment on an item's price.
A calça dessa loja é muito cara.
The pants from this store are very expensive.
In this sentence, 'calça' is used as a verb meaning 'puts on,' specifically referring to footwear.