clinker
noun uk/ˈklɪŋ.kər/ us/ˈklɪŋ.kɚ/
(POWDER)
[ C or U ]炉渣，煤渣
the ash (= powder) and rough, hard pieces that remain after coal has been burned
(MISTAKE)
[ C ] US old-fashioned slang错误；（尤指）奏错的音，唱错的音
a mistake, especially a wrong musical note