(verb) to work extremely hard
A: How is school going? Are you still studying Engineering?
B: Yeah, but it’s so hard! I study for hours every day!
A: Well, just keep working like a dog. If you keep working hard, you’ll be successful one day!
The young football player is going to work like a dog by practicing every day, so he can play professionally one day.
A: You look great! How did you lose so much weight?
B: Well, I worked like a dog and exercised every day.
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