shirk (one's) duty
To avoid, neglect, or evade one's duty or responsibility. You're supposed to manage the company's social media presence throughout the day, but we feel like you've been shirking your duties lately. It turns out that he had shirked his duty as the quality assurance inspector, which resulted in several thousand batches being contaminated with E. coli.
shirk one's duty
to neglect one's job or task. The guard was fired for shirking his duty. You cannot expect to continue shirking your duty without someone noticing.