More black in color; darker than something else or than a previous state.
From Old English 'blæc' (black), possibly from Proto-Germanic 'blakaz'. The comparative form '-er' is one of the oldest ways English forms comparisons, dating back to its Germanic roots.
Interestingly, ancient languages didn't always have a word for 'black'—many early cultures saw it as 'the absence of light' rather than a color itself! The fact that English has such an old, stable word for it shows how important darkness was to our ancestors.
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