to thrust away or push out; to drive or force away; a rare variant of extrude or expel.
From Latin abstrudere 'to thrust away,' from ab- (away) + trudere (to thrust). An archaic or very rare English formation.
This word is so rare that even major dictionaries sometimes don't include it, yet it follows perfectly logical Latin-based word formation rules—if 'extrude' (to push out) exists, 'abstrude' (to thrust away) should logically exist too, even if almost no one uses it.
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