The spelling of the word "more bistred" may seem confusing at first glance, but it can be better understood through its phonetic transcription. The first word, "more," is pronounced as "mɔː," while "bistred" is pronounced as "bɪstrɪd." The suffix "-ed" indicates a past participle, which turns the adjective "bistred" (meaning brownish-grey) into a verb meaning to darken or stain with bistre (a type of brown pigment). Therefore, the phrase "more bistred" means to become even more brownish-grey or stained with bistre.