Sentence:  He thought how this dainty , fragile older woman <WSD>threading</WSD> her way through the streets of Westminster on a day in June , enjoying the flowers in the shops , the greetings from old friends , but never really drawing a deep , passionate breath , was so like himself . 
Meaning of the word marked with <WSD> tags:  to move or cause to move in a sinuous, spiral, or circular course