Members of the same party agree to act and vote more or less together.

She agreed to act as his secretary on a temporary basis.

I'd be honoured if you would agree to act as my best man.

The nurse who looks after her agrees to act as a witness for the police report.

Shah agreed to act in the film immediately upon learning about the character he was offered.

They would agree to act in situations where the national government was unwilling or unable to do so.

He readily agreed to act as a sort of scientific control.

He even agreed to act as best man at their wedding.

Maybe someone would have accepted my theory and agreed to act on it, but I couldn't be sure.

She would never agree to act as his eyes and ears.