in·ves·ti·gate 
/ɪnˈvɛstəˌgeɪt/ verb
in·ves·ti·gates; in·ves·ti·gat·ed; in·ves·ti·gat·ing /ɪnˈvɛstəˌgeɪt/ verb 1 : to try to find out the facts about (something, such as a crime or an accident) in order to learn how it happened, who did it, etc. [+ obj] ▪ The police are still investigating the murder. ▪ The accident was thoroughly investigated. [no obj] ▪ The manager promised to investigate when we pointed out an error on our bill. 2 [+ obj] : to try to get information about (someone who may have done something illegal)
▪ He was investigated for his involvement in the incident.
▪ He was investigated for his involvement in the incident.
— in·ves·ti·ga·tion /ɪnˌvɛstəˈgeɪʃən/ noun, plural in·ves·ti·ga·tions
[count] ▪ Police began an investigation into/of the incident. [noncount] ▪ The accident is under investigation. [=being investigated]
/ɪnˌvɛstəˈgeɪʃən/ noun, plural in·ves·ti·ga·tions [count] ▪ Police began an investigation into/of the incident. [noncount] ▪ The accident is under investigation. [=being investigated]
— in·ves·ti·ga·tor /ɪnˈvɛstəˌgeɪtɚ/ noun, plural in·ves·ti·ga·tors [count]
▪ Investigators revealed their findings.
/ɪnˈvɛstəˌgeɪtɚ/ noun, plural in·ves·ti·ga·tors [count] ▪ Investigators revealed their findings.
