follow up
Do something to check or improve an earlier action
Find our about a problem and act
follow through
Do what is necessary to complete something or make it successful
Continue moving limbs after hitting a ball
follow on
Leave to meet someone after they have left the place you're at
In cricket, if the second team to bat doesn't score enough runs, it has to bat again
follow on from
Be the part of something
follow out
To finish; to complete, especially, of a commitment.