To make a formal request or application for something. She decided to apply for the job at the new company.
To put or spread something onto a surface. He applied the paint evenly across the wall.
To use or employ something for a particular purpose. You should apply this technique to solve the problem.
To be relevant or pertinent to a particular situation. The new rules apply to all employees in the company.
To devote or dedicate oneself or one's efforts diligently to a task or purpose. If you apply yourself to your studies, you'll pass the exam.