Overleave definitions

To leave (something) over; cause to remain or be left.
verb
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(intransitive) To remain; be left over.
verb
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A leave which exceeds the approved or prescribed amount of time.
noun
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Origin of overleave

From Middle English overleven, from Old English oferlǣfan (“to leave over; be left over, remain”), equivalent to over- +‎ leave.