Words which were used to designate one thing but later changed to mean something else have experienced the process of semantic______.
【正确答案】：transfer
【题目解析】：从题干看该题涉及的是语义改变。语义的转变有四种基本形式，扩展（extension）、缩小（narrowing）、升格（elevation）和降格（degradation）, 除了这四种基本形式，还有一种叫做transfer, 它又包含semantic transfer, associated transfer, subject-object transfer, transfer of sensation. 题干给的是semantic transfer 的定义。
