Scottish past participle of 'hae' (have); used in Scottish English to indicate a completed action in the past.
From Old English and Scots, related to 'have.' In Scottish English, 'hae' is the present tense form of 'have,' and 'haen' is the past participle, maintaining an older English form.
Scottish English preserves older forms of English that died out elsewhere—'haen' sounds archaic to modern English speakers, but it's a living part of Scots language. Burns and other Scottish poets used it regularly.
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