The kanji 究究 primarily conveys the idea of "investigation," "research," "to study deeply," or "to go to the end." It implies a thorough examination, a pursuit of knowledge, or reaching a final conclusion after careful consideration. It often suggests a deep dive into a topic or subject.

・On-yomi (音読み): きゅう (kyuu) ・Kun-yomi (訓読み): きわ（める） (kiwa(meru)) - to investigate, to examine thoroughly.

⚫︎研究（けんきゅう） Translation: Research; Study. ⚫︎探究（たんきゅう） Translation: Inquiry; Pursuit of knowledge. ⚫︎追究（ついきゅう） Translation: Pursuit; Investigation; To pursue a matter to its conclusion.

The kanji 究究 is a phono-semantic compound (形声文字). The left side is the radical 穴（あな）, which means "hole" or "cave." The right side is 九（きゅう）, meaning "nine." The original meaning of 究究was related to the depth of a cave, suggesting thorough exploration. The "nine" part is used here phonetically to give the sound. Over time, the meaning evolved to represent a deep investigation or thorough research, akin to exploring the innermost recesses of a subject.