The term 'BARD's Nightfall' is a reference to the poem 'Ode to the West Wind' by the English poet Percy Bysshe Shelley. The poem is about the power of nature and how it can bring about change. The crossword solutions for the term are 'EEN', which is an acronym for 'Evening Evening Nightfall'. This phrase is used to describe the time of day when the sun sets and the night begins. It is a time of transition and transformation, which is what Shelley was trying to convey in his poem.