He is taking it up the ass.

In the winner takes all election, smaller parties struggled to gain any seats.

The winner-takes-all electoral system discouraged smaller parties and concentrated power in the hands of the largest party.

By taking it upon oneself to organize the meeting, Jenna relieved her team of a major burden.

Taking upon oneself more than he could handle, Mark soon became overwhelmed.

When urgent problems arise, one takes it upon oneself to find a solution.

One takes upon oneself the responsibility to speak up when a colleague is being treated unfairly.

When the founding chef retired, his protégé takes up the mantle and transforms the restaurant's menu.

After years of mentorship, she finally felt ready, taking up the mantle her mentor had held for decades.

Her taking up the mantle after the founder's departure signaled a new era for the organization.