he's more and more a Cat" 這樣的句子。後來人們就把"cat"和"copy"連在壹起,用來形容模仿別人舉止的討厭鬼。Copycat最早見諸文字,是在1896年S. O. Jewett的作品"Country of Pointed Firs"中,原句是"I ain't heard of a copy-cat this great many years. It was a favorite term of my grandmother's"。
參考: takeourword/Issue041