plug away at (something)

To "plug away at" something means to keep working hard on it for a long time, without expecting a quick reward.

The example above uses the shorter version, "keep plugging away". The full version uses "at":

Keep plugging away at your acting career, and I'm sure that one day you'll be a huge star.

Although it describes working really hard, the phrase "plug away" sounds positive and friendly.

This phrase appears in these lessons: