What it is: A verb + particle (up/down/on/off…) with a new meaning.
What it’s for: Understand real conversations and informal English.
Example: “turn on” = start (a device)
Common examples
wake up: I wake up at 6.
look for: I’m looking for my keys.
give up: Don’t give up.
pick up: I picked up the package.
find out: I found out the truth.
Key note
Some are separable: “turn the light off” / “turn off the light”
Some are not: “look after” (not “look the baby after”)