check
make sure that there is nothing wrong with someone / something
check on
fail to support or help someone as they had hoped
let down
establish a business
set up
try hard to improve or achieve something
work on
look at or take notice of
check out
punish someone lightly or not at all
let off
to make someone or something different/special
set apart
find the answer to something
work out
tick or otherwise mark an item on a list to show that it has been dealt with
check off
(of something undesirable) becoming less intense
let up
cause a series of things to occur
set off
make somebody or yourself reach a state of great excitement/anger
work up