~ 1
■ noun
1》 the stony residue from burnt coal or from a furnace.
2》 a brick with a vitrified surface.
Origin
C17: from obs. Du. klinckaerd (earlier form of klinker ), from klinken 'to clink'.
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~ 2
■ noun informal
1》 N. Amer. something that is unsatisfactory; a failure.
2》 Brit. dated an excellent or outstanding person or thing.
Origin
C17: from clink 1 + -er 1 .