To sweat profusely
The expression “to sweat one’s brow” is used to mean working hard, enduring hardship, and achieving a goal or gaining profit through one’s own effort and diligence.

(Generated by Artificial Intelligence)
What Does This Expression Mean?
It means to put forth great effort and work hard to achieve a goal or objective. It is used to describe someone attaining success or earning a reward through their own labor and perseverance. This expression emphasizes that things obtained through hard work are valuable and deserved. For example, after completing a difficult task, one might say, “I earned this through sweat and toil.”
How Is It Used in Everyday Life?
This expression is used when someone has worked hard to accomplish a task. For instance, when studying and struggling to complete a school project or carefully performing a task at home with great effort, one might say, “I succeeded by sweating my brow.” The phrase is used to convey that efforts invested in labor are worthwhile.

(Generated by Artificial Intelligence)
Where Does It Come From?
In the past, in agricultural societies or among those engaged in physically demanding labor, the expression was used to highlight the difficulty of the work and the value of the effort, as people would sweat profusely while toiling. Since the forehead is the front part of the head, sweat dripping from it became a metaphor for exhaustion and exertion. Over time, the expression came to be used not only for physical labor but also for any kind of effort requiring mental or emotional exertion.

