Sentence:  Final fillip in the Vice-President's study has been a boning up on Premier Khrushchev's favorite <WSD>foible</WSD>, proverbs. The bibulous Russian leader likes to throw out homely homilies in his speeches and conversations.. 
Meaning of the word marked with <WSD> tags:  A quirk, idiosyncrasy, or mannerism; unusual habit or way (usage is typically plural), that is slightly strange or silly.