The act of becoming dusk or growing dark; the process of approaching twilight or making something dusky.
From 'dusk' with the gerund/present participle suffix '-ing,' creating a noun or verb form that describes the ongoing action of becoming dusky or approaching darkness.
The word 'dusking' captures a moment—it's not about the state of being dark, but the active process of light fading, which is why it appears in poetic descriptions of sunset.
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