1. check in
   Intransitive
   Meaning: arrive and register at a hotel or airport
   Example: We will get the hotel keys when we check in.

 check out
         Intransitive
     Meaning: leave a hotel
         Example: Most hotels require you to check out before 1pm.

          check out someone/something
          Transitive, Separable
Meaning: look at informally
          Example: Check out these boots!  I want a pair.
That guy over there just checked you out!

1. grow up
   Intransitive
   Meaning: become an adult
   Example: When Jack grows up he wants to be a fireman.

When I was a child I wanted to be a veterinarian when I grew up.  What did you want to be when you grew up?