Noun

• S: (n) burden, load, encumbrance, incumbrance, onus (an onerous or difficult concern) "the burden of responsibility"; "that's a load off my mind"
• S: (n) load, loading, burden (weight to be borne or conveyed)
• S: (n) effect, essence, burden, core, gist (the central meaning or theme of a speech or literary work)
• S: (n) burden (the central idea that is expanded in a document or discourse)

Verb

• S: (v) burden, burthen, weight, weight down (weight down with a load)
• S: (v) charge, saddle, burden (impose a task upon, assign a responsibility to) "He charged her with cleaning up all the files over the weekend"