Sentence:  I let up on the accelerator , only to gradually reach again the 60 m. p. h. which would , I hoped , overhaul Herry and the blonde , and as there were cars whose drivers apparently had something more important to catch than had I , Mrs. Major Roebuck settled down to practicing on Corporal Johnson the kittenish wiles she would need when making her <WSD>duty</WSD> call on Colonel and Mrs. Somebody in Sante Fe . 
Meaning of the word marked with <WSD> tags:  the social force that binds you to the courses of action demanded by that force; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr