take office
To assume a position of political authority, especially one that is granted as the result of a public election. The controversial businesswoman had hardly taken office in the senate before becoming immediately embroiled in scandal. I promise that when I take office, I'm going to dedicate my time and energy to solving this city's homelessness crisis.
take office
to begin serving as an elected or appointed official. When did the mayor take office? All the elected officials took office just after the election.
take office
Assume an official position or employment, as in The new chair takes office after the first of the year. [Mid-1800s]