She is putting up the decorations for the party.

He gangs up with his friends to intimidate others.

The students were ganging up on the new kid.

I am calling up my friend to invite him to the party.

He fires up the engine and starts the car.

He fixes up old cars as a hobby.

He is fixing up his old car.

She is firing up the grill for the barbecue.

She throws up after every meal.

She tacked up the poster on the wall.