diagnose
verbUK /ˈdaɪ.əɡ.nəʊz/
US /ˈdaɪ.əɡ.noʊs/
To find out what is wrong with someone or something.
The doctor diagnosed the boy with a bad cold.
OTHER MEANINGS
2. To find the cause of a problem in a machine or system.
The mechanic diagnosed the car's strange noise.
3. To study something closely to understand what is wrong.
Teachers diagnose reading problems to help students improve.
4. To name an illness after careful study.
She was diagnosed with the flu last week.