An archaic or non-standard form, possibly meaning to impoverish or to cause poverty.
Possibly from 'en-' (to cause) + 'poor', or influenced by 'impoverish'. This form does not appear in standard modern dictionaries and may be a historical variant.
This word is so rare that it might be a transcription error from old texts, or perhaps a one-off usage by a Renaissance writer who was experimenting with creating parallel forms to 'impoverish'—language was more fluid back then!
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