To crowd together or throng around; an archaic or rare word meaning to gather in a crowd around something or someone.
From 'en-' plus 'throng' (from Old English thringan meaning to press or crowd). This combines the causative prefix with the noun/verb throng to mean 'to cause to crowd.'
This is an almost forgotten word that perfectly demonstrates how English speakers used to be comfortable making verbs out of almost any noun by adding 'en-'—you'd 'enbattle,' 'entangle,' 'entrench,' and 'enthrong' with ease.
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