In a beaming manner; with brightness, warmth, or a wide happy smile; radiantly.
From beaming (present participle of beam, from Old English 'beam' meaning 'tree or ray of light') combined with the adverb suffix -ly. The sense evolved from physical brightness to emotional radiance.
The word 'beam' originally meant 'tree,' but after people noticed how light beams travel in straight lines like tree trunks, the metaphor stuck—now we 'beam' with happiness!
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