Answer:
Euphemism
Explanation:
Euphemism refers to the term or expression which is used in place of offensive or unpleasant terms. They are used as a medium to disclose certain ideas that are taboo in society. At times, they are focused on amusing thereby covering the offensive reality. The objects are not addressed directly as it may prove negative intended or bring embarrassment. It is used as a means to lessen the negative impact of the word used. As Jane, in the given question uses the term "big-boned", it means that she is using a euphemism. She does not use any negative term as it may bring negative remarks.