Synecdoche is the figure in which a part of something is used to signify the whole , or, more rarely, the whole is used to signify a part . For example, we call a farm laborer a “hand ” , and Milton refers to the corrupt clergy in “Lycidas” as “blind mouths.” When Shake speare say that the cuckoo's song is unpleasing to a “married ear”, he means to a married man.
lycida