weigh somebody or something down
encumber - burden
If something were to ‘encumber’ you, it would slow you down and make it difficult for you to do something. This formal word can refer to physical obstacles that are weighing you down (or psychological ones). To alleviate such constraints is to ‘unencumber’. 'Disencumber' appears to be an older version of 'unencumber', but 'unencumber' is the more common usage, and 'disencumber' is often given as a (synonym) meaning for 'unencumber'.
Alex has enough on his plate at the moment, so I won’t encumber him with my personal problems.
The project has been encumbered by a lack of funding. Unless we can find fresh investment, it will remain stagnant.
To increase productivity we must unencumber the workforce by cutting through all the unnecessary bureaucracy and red tape.