To make glad or to gladden something completely; archaic or poetic.
Combining the intensive prefix be- with the adjective glad (from Old English glæd, meaning cheerful or bright). The prefix transforms the adjective into a verb meaning 'to cause to be glad.'
The prefix 'be-' can turn almost any adjective into a verb—'becalm,' 'befoul,' 'bejewel'—and it's a trick that was much more productive in Middle English and Early Modern English than it is today. Shakespeare used it constantly to create new verbs on the fly.
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