To decorate with glitter or to make sparkle and shine; to cover with a glittering substance.
Combining the prefix be- with glitter (from Middle English gliteren, possibly from Scandinavian sources, meaning to shine brightly or sparkle). The prefix intensifies the effect.
The word 'glitter' itself is relatively young in English—it didn't appear until around the 1400s, probably from Scandinavian traders. Yet it perfectly captures what it means through sound: the 'tt' doubles suggest flickering, repeated sparkles.
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