forget it

You think you're getting into university with these grades? Well, forget it!

What were you saying? – Oh, it was nothing important, forget it.

Thank you so much! How can I repay you for your kindness? – Forget it; it was nothing.

It's raining. I said, "It's raining." Do you hear me? It's raining! Oh, forget it!

So, life is disappointing? Forget it. We have no problems here. In here, life is beautiful! The girls are beautiful! Even the orchestra is beautiful.