expression, suru verb (irregular)
concentrate one's attention; focus; be engrossed in
A set phrase meaning to direct one's full attention to something. Often used when one needs to focus on a task or object.
試験中は問題に注意を集中しなければならない。
During the exam, you must concentrate your attention on the questions.
彼は研究に注意を集中している。
He is engrossed in his research.