Sentence:  Since musicians do not have native competence in producing the style from which they have appropriated, they have to <WSD>'undercode</WSD>' to some extent. (Eco. 1976: 135—6). 
Meaning of the word marked with <WSD> tags:  To communicate using codes that do not convey the entire message, but which rely on the recipient's construction of meaning through connotation or subtexts.