Study the information about phrasal verbs + up.
1. Bring up a topic = introduce it in a conversation
Come up = be introduced in a conversation
Come up with an idea = produce an idea
Make something up = invent something that is not true
Some interesting matters came up in our discussion yesterday.
I don’t want to hear any more about this matter. Please don’t bring it up again.
2. Cheer up = be happier
Save up = save money to buy something
Clear up = become bright (for weather)
Dan is saving up for a trip round the world.
3. Blow up = explode
Blow something up = destroy it with a bomb
Tear something up = tear it into pieces
Beat somebody up = hit someone repeatedly, so that they are badly hurt
I didn’t read the letter. I just tore it up and threw it away.
4. Break up/split up = separate
Do up a coat = fasten, tie
Do up a building, a room= repair and improve it
Look something up in a dictionary
Put up with something = tolerate it
Hold up a person, a plan = delay
Mix up people/things, get people/things mixed up = you think one is the other.
The two brothers look similar. Many people mix them up.
The kitchen looks great now that it has been done up.
Raymond Murphy. English Grammar in Use- Cambridge: CUP, 379p.