Sentence:  Know I as soon as dark's dreams begin Snared is my heart in a nightmare's gin; Never from terror I out may win; So dawn and dusk I pine, peak, thin, Scarcely <WSD>beknowing</WSD> t'other from which—My great grandam—She was a Witch. 
Meaning of the word marked with <WSD> tags:  To know about; have knowledge of; recognise; understand; be aware (of); be knowledgeable about.