designed for heavy work
under a moral obligation to do something
exempt from duty
naval service aboard a ship at sea
a tax imposed on ships that enter the US; based on the tonnage of the ship
the social force that binds you to the courses of action demanded by that force; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr
work that you are obliged to perform for moral or legal reasons
a government tax on imports or exports
