Be in on
Be involved in
Cash in on
Benefit or make money on something, especially if done unfairly
Close in on
Get near someone
Clue in on
Give someone the information they need
Fill in on
Give someone information
Get in on
Become involved
Home in on
Target
Hone in on
Target, focus
Key in on
Focus attention on, single out
Let in on
Tell someone a secret, inform them or allow them to participate
Look in on
Visit briefly to see if everything's all right
Move in on
Approach, often stealthily
Muscle in on
Become involved in something despite opposition to your involvement
Sit in on
Attend as an observer
Walk in on
Enter somewhere unexpectedly and see something
Weigh in on
Enter an argument or discussion to express a strongly felt idea
Zero in on
Direct or focus attention on
Zone in on
Pay attention after not doing so
Zoom in on
Focus more closely