The word "抑郁" is formed by combining two characters, each contributing distinct semantic elements to convey the concept of depression. "抑" carries the meaning of suppression or restraint, often implying a holding down or repressing force, while "郁" conveys gloominess, melancholy, or a dense, accumulated sadness. Together, they create a compound where "抑" modifies "郁" to express a state where gloom is internally suppressed or pent up, thus encapsulating the nuanced experience of depressive feelings as both inward and oppressive. This formation draws from classical Chinese literary traditions where such semantic blends are used to evoke complex emotional states.