throw away

He wanted to throw away the cup, but he couldn't find a trash can.

Voting for a third-party candidate sometimes feels like throwing your vote away.

As Gilly plays sitcom wife, reading aloud from a book while Sam tries to read his own across the table, she throws away a line about someone named Maynard once having annulled the marriage of someone named Prince Raggar and remarrying him in the same ceremony in Dorne.