pick

When you pick something, you choose it.

Example: I have picked the best people to work on this job.

If you pick up something, you lift it.

Example: She picked up the glass and put it down again.

If you pick up the phone, you answer it.

If you pick something up from somewhere, you go and get it.

Example: Mom, can you pick me up from Austin's at 8:00?

If you try to pick up someone you have just met, you talk to them because you want to have sex with them.