the ash and partially fused residues from a coal-fired furnace or fire
2. Also called: clinker brick
a hard brick used as a paving stone
3.
a partially vitrified brick or mass of brick
4. slang, mainly US
something of poor quality, such as a film
5. US and Canadian slang
a mistake or fault, esp a wrong note in music
verb
6. (intransitive)
to form clinker during burning
Word origin
C17: from Dutch klinker a type of brick, from obsolete klinckaerd, literally: something that clinks (referring to the sound produced when one was struck),from klinken to clink1