(verb) to begin to work extremely hard
Example Sentences:
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, start rolling up your sleeves. If you keep working hard, you’ll be successful one day!
The young football player is going to roll up his sleeves 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 rolled up my sleeves and exercised every day.
A: Fantastic!