He rang up the curtain before the performance started.

The stage crew is ringing up the curtain for the opening act.

He ran up the curtain to reveal the stage.

The stage manager rings up the curtain before the play starts.

He took up the slack and completed the project on time.

She is taking up the slack in the project.

The new employee has taken up the slack in the department.

He takes up the slack when his colleagues are absent.

She always picks up the slack when her coworkers are absent.

She picked up the slack and completed the project on time.