take it upon oneself

present singular third person takes it upon oneself · participle present taking it upon oneself · past took it upon oneself · participle past taken it upon oneself

1. idiomaticTo assume personal responsibility for a task or action.

   She took it upon herself to manage the project.

   1 more example

   The home secretary of the day, the bumptious Sir William Joynson-Hicks, took it upon himself to attend the house, a formality dating from the 17th century to ensure no impostors were substituted, ostensibly to ensure all was well, and he proclaimed the news publicly, even though the government was then in mid-crisis over the forthcoming general strike.

   September 8 2022, Stephen Bates, “Queen Elizabeth II obituary”, in The Guardian