Polysemy in English language is a process from a base meaning to other ones by cognitive tool of human beings The cognition of metaphor is the key to form polysemy.

• 英语中的一词多义现象就是人类通过认知手段由一个词的中心意义或基本意义向其他意义的延伸,隐喻认知对多义词的形成起着无可替代的作用。