This is the 13289th most frequent Polish word.
opłacić
"Opłacić" means "to pay for."
Here, 'opłacić' refers to paying a due or bill.
Muszę opłacić rachunki za prąd.
I need to pay the electricity bills.
In this context, 'opłacić' is a reflexive verb meaning that something is worth the cost or effort.
Czy myśli Pan, że to się opłaci?
Do you think it will be worth it?
Here, 'opłaciło się' expresses a payoff or benefit gained from an effort.