详细解释:n. 敲击者(或物), 敲门者, 门环
【电】 开锤
相关词组:
up to the knocker
英语解释：
名词 knocker:
(Yiddish) a big shot who knows it and acts that way; a boastful immoderate persona person who knocks (as seeking to gain admittance)one who disparages or belittles the worth of something同义词：detractor, disparager, depreciator