Antonyms for the phrase "takes up on oneself" include "abstain from," "decline," "refuse" and "reject." Instead of assuming responsibility or burden, these antonyms suggest avoiding or declining it altogether. Other antonyms may include "shirk," "evade," "ignore," and "neglect," which all imply an avoidance of responsibility or duty. By contrast, synonyms for "takes up on oneself" may include "undertake," "accept," "shoulder," and "assume," which suggest actively taking responsibility or duty. It is important to understand the antonyms for a phrase to understand the full context and meaning of the word.