Break-down: If a machine or vehicle breaks down, it stops working.
Verb. Our car broke down and we had to push it off the road.
Catch-on: To become fashionable or popular.
Verb. I wonder if the game will ever catch on with young people?
Grow up: To gradually become an adult.
Verb. Taking responsibility for yourself is part of the process of growing up.
Look into: To examine the facts about a problem or situation.
Verb. We're looking into the possibility of merging the two departments
