To explain or discuss something in excessive detail or for too long; to overwork an idea or argument to the point of redundancy. Can also mean to attack or assault repeatedly.
From the prefix 'be-' (thoroughly) and 'labor' (to work). Originally meant to work at something excessively, then evolved to mean dwelling on a point beyond what's necessary or useful.
Don't belabor the point about 'belabor' - it's like beating a dead horse! When you belabor something, you're working it to death, explaining it so much that your audience wants to escape your 'labor-ious' explanation.
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