The kanji 深 primarily conveys the idea of "deep," both literally and figuratively. It signifies something that extends far down, inward, or to a significant degree. This can apply to physical depth like the ocean or a hole, or abstract concepts like deep feelings, deep thought, or deep understanding.

・On-yomi (音読み): シン (shin) ・Kun-yomi (訓読み): ふかい (fukai) - deep, ふかまる (fukamaru) - to deepen, ふかめる (fukameru) - to deepen

⚫︎ 深い海 Translation: Deep sea ⚫︎ 友情を深める Translation: To deepen friendship ⚫︎ 深い理解 Translation: Deep understanding

The kanji 深 is a phono-semantic compound (形声文字, けいせいいもじ). ⚫︎ The semantic component is 水 (みず, water), indicating the connection to something related to water. ⚫︎ The phonetic component is 㕚 (which is now considered obsolete, but it implied the sound "shin"). ⚫︎ Therefore, the structure suggests "deep water" or "extending into the water", and the sound of the word "shin" is related to water.