noun
the part of a ship's cargo carrying capacity that is left over after the essential cargo has been loaded
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The ship's after-burthen was carefully calculated to ensure proper balance.
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The after-burthen of that project was a lot more work than we anticipated.
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I had to deal with the after-burthen of cleaning up the mess my roommate made.
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The after-burthen of her decision weighed heavily on her conscience.