Sentence:  Hail! nurse of thought, with brow serene; / Who, as the sun, so wont, retires, / And leaves the sky to milder fires, / <WSD>Tingest</WSD> with shadowy forms the fading scene, [...] 
Meaning of the word marked with <WSD> tags:  To affect or alter slightly, particularly due to the actual or metaphorical influence of some element or thing.