burden >> /ˈbərdn/
Definition: [transitive verb] Load heavily.
Example: she walked forward burdened with a wooden box
Definition: [noun] A load, typically a heavy one.
Example: And laying my heavy burden in the safe hands of the luggage compartment I went to my seat and was given rest.
Definition: [noun] The main theme or gist of a speech, book, or argument.
Example: the burden of his views
Definition: [noun] The refrain or chorus of a song.
Example: It is to be found in many cultures and periods, for example in the medieval carol, where the burden represents the A section.