act on somebody's authority

The form must be signed either by the master or a person authorised and acting on the master's authority.

Sherman may have acted on his own authority.

"I decided to act on my own authority."

The international mission needs greater legitimacy in order to accelerate the process leading to a government acting on its own authority in Iraq.

Sometimes, in great emergencies, they might even act on their own authority and responsibility.

"Tell them you act on my authority, that I am concerned for their health," Cinhil said softly.

The project holders are independent and act on their own authority during the regional project implementation.

During the recent G20 meeting, many promises were made that will be hard to keep if countries act on their own authority.

"Not if you act on your own authority," Picard said.

He acted on his own authority, but the thinking is sound.