to make a hole; to cause someone to feel weary through lack of interest
from Old English borian meaning 'to pierce', the 'tedious' sense developed in 18th century
It's no coincidence that 'bore' means both 'to drill a hole' and 'to be tedious' - when something bores you, it's like it's drilling a hole in your patience! The tedious meaning is actually much newer than the drilling one.
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