What does “sprzeciw” mean?

Objection, for example to a court payment order (nakaz zapłaty). If you send it in time, the order stops and the court looks at the case properly.

What to do

You usually have 2 weeks from delivery. Give your reasons and evidence, and follow the pouczenie that came with the order.

“sprzeciw” is a Polish word used in official letters in Poland. Briefly explains words like this automatically when you check a letter.