Sentence:  Edward Churchill still attended to his work in a hopeless mechanical manner like a sleep-walker who <WSD>walks</WSD> safely on a well-known round. But his Roman collar galled him, his cossack stifled him, his biretta was as uncomfortable as a merry-andrew's cap and bells. 
Meaning of the word marked with <WSD> tags:  To move on the feet by alternately setting each foot (or pair or group of feet, in the case of animals with four or more feet) forward, with at least one foot on the ground at all times. Compare '''run'''.