Smiled widely and brightly with joy, or transmitted light or radio signals in a particular direction.
From Old English 'beam' meaning a ray of light or piece of wood. As a verb meaning to smile, it emerged in the 19th century, possibly influenced by the brightness of a smile.
When you 'beam with pride,' you're literally described as radiating light—and that's not just poetry; MRI scans show that happy people's faces do appear to 'light up' because more facial muscles create more reflection!
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