To make glad or to brighten; a variant or archaic form of 'gladden.'
From Old English 'gladian' or influenced by 'gladden'; represents an earlier verb form before the '-en' suffix became standard.
This archaic verb shows language evolution—Old English could 'gladen' you, but by Early Modern English, we preferred 'gladden' with the '-en' ending, which sounded more like other causative verbs.
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