A dialectal or archaic term meaning to act as a guest or to receive as a guest.
From 'guest' plus '-en' (an archaic verb-forming suffix, as in 'darken,' 'weaken'). This represents an older English pattern for creating verbs, now largely superseded by '-ify' or simple verb use.
The '-en' suffix (from Old English) created verbs meaning 'to become' or 'to cause to be'—it's nearly disappeared from modern English except in remnants like 'blacken' and 'loosen,' making 'guesten' a window into how English's word-formation system has shifted over centuries.
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