concentrate
/ˈkɑːnsənˌtreɪt/
verb
-trates; -trated; -trating
[no obj] :to think about something :to give your attention to the thing you are doing, reading, etc.
[+ obj] :to cause (attention, efforts, strength, etc.) to be used or directed for a single purpose - usually + on
[+ obj] :to make (something, such as a liquid) stronger by removing water
concentrate the/your mind
Something that concentrates the/your mind makes you think very clearly.
noun
plural -trates
a substance that is made stronger or more pure by removing water [count]