"clinker" in the noun sense
1. cinder, clinker
a fragment of incombustible matter left after a wood or coal or charcoal fire
2. clinker, clinker brick
a hard brick used as a paving stone
"clinker" in the verb sense
clear out the cinders and clinker from
"we clinkered the fire frequently"
turn to clinker or form clinker under excessive heat in burning
Source: WordNet® (An amazing lexical database of English)
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