a duty
to free one from obligations―release one from obligations―discharge one from obligations―dispense one from obligations
to shirk one's duty―evade a duty―be freed from one's obligations―be discharged from one's obligations
義務を怠ること.
to discharge one from obligations―dispense one from obligations
I have been obliged to
to evade one's duty―shirk one's duty―be freed from obligations―be discharged from one's obligations