"Exert" is a verb that means to use or employ force, effort, or energy to do something. It is often used in the context of physical activity, mental effort, or exerting influence or authority. Here are a few examples of how "exert" can be used:
1. Physical Effort: "He exerted himself to lift the heavy box."
2. Mental Effort: "She exerted her full attention to understand the complex problem."
3. Authority or Influence: "The government exerted pressure on the company to change its policies."
4. Energy: "She exerted every ounce of energy to finish the marathon."
In a sentence, you might say, "He will need to exert himself to complete the task in time."
