This is a dereliction of duty, pure and simple—a firing offense.
Around this time, he was reprimanded, unfairly, on two counts of dereliction of duty.
By rejecting this last attempt to suborn a dereliction of duty, Henry saved my reputation, my honor, my life, really.
1590s, "abandonment" (formerly with a wider range than in modern use, e.g. of the sea withdrawing from the land), from Latin derelictionem (nominative derelictio), noun of action from past participle stem of derelinquere (see derelict). Meaning "failure in duty" is from c.1830.