A soucar is a person who lends money and charges a lot of interest.
In some stories, a soucar is a bad person who takes advantage of others who need money.
Examples:
The soucar lent me money, but now I owe a lot.
The soucar charges too much for borrowing money.
I don't want to borrow from the soucar, he asks for too much back.
The soucar is so rich, he must have a lot of money from lending.
In the story, the soucar took all the money from the poor people.
The soucar's big house is full of money from lending.