Question

The excerpt below is from a speech about starting a debate club at a high school. Which of the choices best describes the figurative meaning of the phrase "sharpen their brains"?
Scientific studies have shown that the brain is like a muscle. As with any muscle, exercise is good for the brain. Starting a debate team at our school would give interested students a place to exercise and sharpen their brains. As a bonus, they would get to have fun, make new friends, and learn life skills.

Answer 1

The figurative meaning of the phrase sharpen the brains" is---> to improve memory.

As scientific studies help the students in knowing more facts and make them active.

The students get more knowledge , interesting skills frm scientific studies. So, the possible meaning of the phrase is to - Increase memory