hammered away

As the campaign season heated up, his opponent hammered away on the issue.

After singing, Uncle Wiggily hammered away at the stone with his crutch again, but the song did no good.

Night and day they hammered away, coming on like great waves.

But at night, he and Cyrus hammered away in the little log workshop, as though they were a pair of conspirators.

At the same moment he caught up a hatchet, and hammered away vigorously with the back of it at the awl.

Then she hastily hammered away every particle of glass from the frame, and, shoving her shoulders through, looked out and down.