clinker
noun
[ ˈklɪŋkə ]
• the stony residue from burnt coal or from a furnace.
Origin:
mid 17th century: from obsolete Dutch klinckaerd (earlier form of klinker ), from klinken ‘to clink’.
clinker
noun
• something that is unsatisfactory, of poor quality, or a failure.
• "marketing couldn't save such clinkers as these films"
• something or someone excellent or outstanding.
• "she was a real clinker"
Origin:
late 17th century (denoting a person or thing that clinks): from clink1 + -er1. clinker2 (sense 2 of the noun) dates from the mid 19th century, clinker2 (sense 1 of the noun) from the 1930s.