Sentence:  Thus I would describe 'He took his leave and the wrong umbrella' as <WSD>zeugma</WSD>, but not 'He took his hat and umbrella'. / <WSD>Zeugma</WSD> is an important element in Chaucer's poetic technique, not because he uses it, but because he so regularly turns it down. 
Meaning of the word marked with <WSD> tags:  Syllepsis.