study 《the political situation》; investigate 《the causes of an accident》; examine 《somebody's past record》; inquire [look] into 《a matter》; check (up) on 《somebody, something》; check out 《a story》; look [go] over something; find out 《what is wrong》
〈細かく調べる〉 comb over 《the papers》; go into 《the murder case》
〈参考する〉 refer to 《a map》; 【形式ばった表現】 consult 《a dictionary》
徹底的に調べる
investigate something thoroughly
【形式ばった表現】 make a thorough investigation of something
《口語》 give something a thorough going‐over
答案を調べる
荷物を調べる
書類を調べる
経歴を調べる
電話番号を調べる
look up [find] somebody's telephone number 《in the telephone book》
look up a word in a dictionary
【形式ばった表現】 consult a dictionary for the meaning [usage] of a word.