Sentence:  A sharper <WSD>sidleth</WSD> up to him, / "Why bettest thou not?" saith he. / For a moment's space the stranger's face / Was a wondrous thing to see. 
Meaning of the word marked with <WSD> tags:  "In the intransitive sense often followed by" '''(up)''': to (cause something to) advance in a coy, furtive, or unobtrusive manner.