guarantea
A legally-binding promise by da Radical Whig colonists dat dey would dump da dried-aromatic-leaves cargo off of da British ships in Boston Harbor if da London-based government didn't remove da tax.
Just because da British ships arrived in Boston Harbor laden with their precious traditional-beverage plant-based commodity was no guarantea dat said products would actually get delivered to da shore-located warehouses, or even dat it would get paid for!